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    <title>Mojang Studios Jira</title>
    <link>https://bugs.mojang.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en</language>    <build-info>
        <version>9.12.2</version>
        <build-number>9120002</build-number>
        <build-date>10-01-2024</build-date>
    </build-info>


<item>
            <title>[MC-315] Chunks do not delete properly remaining in a newly created world if the same world name is reused</title>
                <link>https://bugs.mojang.com/browse/MC-315</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;h3&gt;&lt;a name=&quot;Thebug&quot;&gt;&lt;/a&gt;The bug&lt;/h3&gt;
&lt;p&gt;I made a superflat world when i noticed a huge structure in the fog. So i closed up on it and it was a chunk from the default world.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;Howtoreproduce&quot;&gt;&lt;/a&gt;How to reproduce&lt;/h3&gt;
&lt;p&gt;It seems to be kinda random and very rare but I&apos;ve been able to do it only 4 times &lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Make a superflat world(default)&lt;/li&gt;
	&lt;li&gt;Travel around a bit and if you&apos;re lucky you&apos;ll find one. (I once even spawned in one)&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="11575">MC-315</key>
            <summary>Chunks do not delete properly remaining in a newly created world if the same world name is reused</summary>
                <type id="1" iconUrl="https://bugs.mojang.com/secure/viewavatar?size=xsmall&amp;avatarId=18903&amp;avatarType=issuetype">Bug</type>
                                    <status id="5" iconUrl="https://bugs.mojang.com/images/icons/statuses/resolved.png" description="A resolution has been taken, and it is awaiting verification by reporter. From here issues are either reopened, or are closed.">Resolved</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="5">Cannot Reproduce</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="gregmilson">Greg Milson</reporter>
                        <labels>
                            <label>chunk</label>
                            <label>mojang_internal_1</label>
                            <label>rendering</label>
                            <label>superflat-world</label>
                            <label>world-generation</label>
                            <label>world-name</label>
                    </labels>
                <created>Thu, 25 Oct 2012 03:45:20 +0200</created>
                <updated>Fri, 14 Aug 2020 04:00:23 +0200</updated>
                            <resolved>Thu, 2 Jul 2020 14:22:22 +0200</resolved>
                                    <version>Minecraft 1.4.1</version>
                    <version>Minecraft 1.4.4</version>
                    <version>Minecraft 1.4.6</version>
                    <version>Minecraft 1.4.7</version>
                    <version>Snapshot 13w05b</version>
                    <version>Snapshot 13w07a</version>
                    <version>Snapshot 13w09a</version>
                    <version>Snapshot 13w09b</version>
                    <version>Snapshot 13w09c</version>
                    <version>Snapshot 13w10b</version>
                    <version>Minecraft 1.5</version>
                    <version>Snapshot 13w11a</version>
                    <version>Minecraft 1.5.1</version>
                    <version>Snapshot 13w16b</version>
                    <version>Minecraft 1.5.2</version>
                    <version>Snapshot 13w17a</version>
                    <version>Snapshot 13w22a</version>
                    <version>Snapshot 13w24a</version>
                    <version>Snapshot 13w24b</version>
                    <version>Snapshot 13w25a</version>
                    <version>Snapshot 13w25b</version>
                    <version>Snapshot 13w25c</version>
                    <version>Minecraft 1.6.1</version>
                    <version>Minecraft 1.6.2</version>
                    <version>Minecraft 13w36b</version>
                    <version>Minecraft 13w37a</version>
                    <version>Minecraft 13w39b</version>
                    <version>Minecraft 1.7.1</version>
                    <version>Minecraft 1.7.2</version>
                    <version>Minecraft 1.7.3</version>
                    <version>Minecraft 1.7.4</version>
                    <version>Minecraft 14w02c</version>
                    <version>Minecraft 14w03b</version>
                    <version>Minecraft 14w04a</version>
                    <version>Minecraft 14w04b</version>
                    <version>Minecraft 14w05a</version>
                    <version>Minecraft 14w05b</version>
                    <version>Minecraft 14w06b</version>
                    <version>Minecraft 14w07a</version>
                    <version>Minecraft 14w08a</version>
                    <version>Minecraft 1.7.5</version>
                    <version>Minecraft 14w11b</version>
                    <version>Minecraft 1.7.8</version>
                    <version>Minecraft 1.7.9</version>
                    <version>Minecraft 14w18b</version>
                    <version>Minecraft 14w19a</version>
                    <version>Minecraft 14w29b</version>
                    <version>Minecraft 14w30c</version>
                    <version>Minecraft 1.8</version>
                    <version>Minecraft 1.8.1-pre3</version>
                    <version>Minecraft 1.8.3</version>
                    <version>Minecraft 1.8.8</version>
                    <version>Minecraft 15w33a</version>
                    <version>Minecraft 15w33b</version>
                    <version>Minecraft 15w35b</version>
                    <version>Minecraft 1.8.9</version>
                    <version>Minecraft 1.9 Pre-Release 4</version>
                    <version>Minecraft 1.9</version>
                    <version>Minecraft 1.10.2</version>
                    <version>Minecraft 16w38a</version>
                    <version>Minecraft 16w40a</version>
                    <version>Minecraft 1.11</version>
                    <version>Minecraft 16w50a</version>
                    <version>Minecraft 1.11.2</version>
                    <version>Minecraft 1.12.2</version>
                    <version>Minecraft 18w11a</version>
                    <version>Minecraft 18w16a</version>
                    <version>Minecraft 18w19b</version>
                    <version>Minecraft 18w20c</version>
                    <version>Minecraft 18w21b</version>
                    <version>Minecraft 18w22b</version>
                    <version>Minecraft 18w22c</version>
                    <version>Minecraft 1.13-pre1</version>
                    <version>Minecraft 1.13-pre2</version>
                    <version>Minecraft 1.13-pre3</version>
                    <version>Minecraft 1.13-pre4</version>
                    <version>Minecraft 1.13-pre5</version>
                    <version>Minecraft 1.13-pre6</version>
                    <version>Minecraft 1.13</version>
                    <version>Minecraft 18w30a</version>
                    <version>Minecraft 18w30b</version>
                    <version>Minecraft 1.13.1-pre1</version>
                    <version>Minecraft 1.13.1</version>
                    <version>Minecraft 1.13.2-pre1</version>
                    <version>Minecraft 1.13.2</version>
                    <version>Minecraft 18w43a</version>
                    <version>Minecraft 18w43b</version>
                    <version>Minecraft 18w43c</version>
                    <version>Minecraft 19w07a</version>
                    <version>Minecraft 19w08b</version>
                    <version>Minecraft 19w12b</version>
                    <version>Minecraft 19w13a</version>
                    <version>Minecraft 1.14 Pre-Release 2</version>
                    <version>Minecraft 1.14 Pre-Release 3</version>
                    <version>Minecraft 1.14 Pre-Release 4</version>
                    <version>Minecraft 1.14 Pre-Release 5</version>
                    <version>Minecraft 1.14.2</version>
                    <version>Minecraft 1.14.3 Pre-Release 3</version>
                    <version>1.14.4</version>
                    <version>19w40a</version>
                    <version>1.15.2</version>
                    <version>20w08a</version>
                    <version>20w10a</version>
                                    <fixVersion>Minecraft 13w38a</fixVersion>
                                                        <votes>92</votes>
                                    <watches>43</watches>
                                                                            <comments>
                            <comment id="754615" author="violine1101" created="Fri, 3 Jul 2020 12:04:44 +0200"  >&lt;p&gt;Policies can change.&lt;/p&gt;

&lt;p&gt;If we just pick any random version as fix version, it&apos;s a false statement as well. Nevertheless, this is not the place to discuss that.&lt;/p&gt;</comment>
                            <comment id="754613" author="farogaming" created="Fri, 3 Jul 2020 11:52:49 +0200"  >&lt;p&gt;It has always been the normal thing to just pick any reasonable version then. &quot;Cannot reproduce&quot; is simply false. It also suggests that people are supposed to try to reproduce it, which would just waste time in this case.&lt;/p&gt;</comment>
                            <comment id="753676" author="cubethethird" created="Thu, 2 Jul 2020 14:57:16 +0200"  >&lt;p&gt;If you are able to provide the game version upon which this was fixed, I can try to update accordingly.&lt;/p&gt;</comment>
                            <comment id="753656" author="bugi74" created="Thu, 2 Jul 2020 14:42:48 +0200"  >&lt;p&gt;I would think the correct resolution is &quot;fixed&quot;, since it was reproduced plenty of times before. &quot;Cannot reproduce&quot; resolution (at least in the meaning I&apos;ve seen it used usually) basically would mean the issue could not be confirmed by testing at any point (thus not valid issue) &lt;img class=&quot;emoticon&quot; src=&quot;https://bugs.mojang.com/images/icons/emoticons/tongue.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;, which obviously isn&apos;t the case here.&#160; Yeah, yeah, I&apos;m nitpicking, while happy it has been fixed. Finally.&lt;/p&gt;</comment>
                            <comment id="753372" author="numeritos" created="Thu, 2 Jul 2020 11:11:53 +0200"  >&lt;p&gt;Unable to reproduce in &lt;b&gt;1.16.1&lt;/b&gt; and &lt;b&gt;20w27a&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Video: &lt;a href=&quot;https://youtu.be/LMtDccVBYfo&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://youtu.be/LMtDccVBYfo&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="742525" author="bugi74" created="Wed, 24 Jun 2020 19:04:21 +0200"  >&lt;p&gt;I can confirm the fix. Game now detects existing folders (that do not have complete saved world), and add a counter ( (1), (2), ...) in the end of the directory name when creating a new world with the same old name.&lt;/p&gt;

&lt;p&gt;Funny detail: if naming the new world like &quot;name (1)&quot; (i.e. includes the counter in the name) and there is already such directory, game will add another counter, saving to &quot;name (1) (1)&quot;.&lt;/p&gt;

&lt;p&gt;Even if the bug isn&apos;t fixed, per se, as the garbage save data is still left there, the solution fulfills the overall goal of not getting wrong chunks in a new world. I thus consider this issue as good as fixed.&lt;/p&gt;</comment>
                            <comment id="741738" author="numeritos" created="Wed, 24 Jun 2020 11:55:46 +0200"  >&lt;p&gt;Unable to reproduce with the steps @&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=bugi74&quot; class=&quot;user-hover&quot; rel=&quot;bugi74&quot;&gt;bugi74&lt;/a&gt; has provided, Minecraft always creates a (1) folder instead of using the older with the old files, tested on &lt;b&gt;1.16&lt;/b&gt;&lt;/p&gt;</comment>
                            <comment id="634761" author="bugi74" created="Sat, 15 Feb 2020 22:50:24 +0100"  >&lt;p&gt;Do read the comments; the reproduction is not deterministic if using only Minecraft (one would need really tight timing and luck), and the reproduction steps in the description are woefully inadequate.&lt;/p&gt;

&lt;p&gt;From my memory, from years back, so might not work as is, but... a better process could be:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;create world with specific name&lt;/li&gt;
	&lt;li&gt;exit game&lt;/li&gt;
	&lt;li&gt;delete certain world save files (enough to make the game think the world is not there), but leave some chunk data files. This manual step simulates effects of world deletion being incomplete (for reason or other, e.g. &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt;).&lt;/li&gt;
	&lt;li&gt;start game again&lt;/li&gt;
	&lt;li&gt;create a new world (random or explicitly different seed) with that same specific name&lt;/li&gt;
	&lt;li&gt;move around to notice chunk issues&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Note also the relate issues &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt; and its comments.&lt;/p&gt;</comment>
                            <comment id="634760" author="misoloo" created="Sat, 15 Feb 2020 22:40:04 +0100"  >&lt;p&gt;I&apos;m unable to replicate this either with the steps that Nathan provided. &lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=gregmilson&quot; class=&quot;user-hover&quot; rel=&quot;gregmilson&quot;&gt;gregmilson&lt;/a&gt; are you sure this is still happening? If so please edit the description and specifically the steps to reproduce.&lt;/p&gt;</comment>
                            <comment id="537911" author="galaxy_2alex" created="Tue, 23 Apr 2019 07:27:42 +0200"  >&lt;p&gt;I am unable to reproduce this in any way. Please add the console log, as well as concrete steps on how to reproduce this issue, as the current provided steps are not sufficient.&lt;/p&gt;</comment>
                            <comment id="510741" author="farogaming" created="Sun, 6 Jan 2019 15:50:25 +0100"  >&lt;p&gt;Oh, you meant it the other way around. Yes, you&apos;re right.&lt;/p&gt;</comment>
                            <comment id="510739" author="farogaming" created="Sun, 6 Jan 2019 15:12:53 +0100"  >&lt;p&gt;No, they are exactly the same.&lt;/p&gt;</comment>
                            <comment id="496845" author="nixinova" created="Fri, 26 Oct 2018 03:22:57 +0200"  >&lt;p&gt;Replace superflat with buffet and this happens as well&lt;/p&gt;</comment>
                            <comment id="471590" author="poollovernathan" created="Sun, 15 Jul 2018 22:53:07 +0200"  >&lt;p&gt;I do not play Java, but it sounds like the instructions are different.&lt;br/&gt;
Maybe they are:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Make a normal world and write down what you named it (you need it later)&lt;/li&gt;
	&lt;li&gt;Delete the world&lt;/li&gt;
	&lt;li&gt;Quickly create a world with the name you wrote down, but make it Superflat this time&lt;/li&gt;
	&lt;li&gt;Move around quite a bit and you should find chunks from the normal world&lt;/li&gt;
&lt;/ol&gt;
</comment>
                            <comment id="456482" author="miwob" created="Tue, 29 May 2018 19:51:34 +0200"  >&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=gregmilson&quot; class=&quot;user-hover&quot; rel=&quot;gregmilson&quot;&gt;gregmilson&lt;/a&gt;, ticket is yours now&lt;/p&gt;</comment>
                            <comment id="456342" author="gregmilson" created="Tue, 29 May 2018 09:31:17 +0200"  >&lt;p&gt;Affects 18w21b&lt;/p&gt;</comment>
                            <comment id="429955" author="scarrow667" created="Fri, 19 Jan 2018 07:31:48 +0100"  >&lt;p&gt;So I&apos;ve seen this happen a decent number of times. I regularly play hardcore and just use New World to get a random seed. I always delete my old hardcore game when I die, but currently that means telling it once when I die, but that doesn&apos;t really delete it, so an additional time selecting it from my game list and then deleting it and confirming the deletion.&lt;/p&gt;

&lt;p&gt;If the window between my deleting the old world and the new one is too small I&apos;ll often see this bug. Is there really a reason that the delete operation can&apos;t just block until it is truly deleted?&lt;/p&gt;</comment>
                            <comment id="346382" author="jifish" created="Mon, 28 Nov 2016 13:04:01 +0100"  >&lt;p&gt;Still present in 1.11&lt;/p&gt;</comment>
                            <comment id="334762" author="gaspoweredpick" created="Wed, 12 Oct 2016 20:20:24 +0200"  >&lt;p&gt;I was playing survival mode on singleplayer, and i went caving in extreme hills, then i got out and all the sudden i saw a huge tower of extreme hills generated in the plains that wasn&apos;t there before. there was no lag or relog, it just appeared.&lt;/p&gt;</comment>
                            <comment id="327526" author="cubethethird" created="Tue, 30 Aug 2016 16:01:47 +0200"  >&lt;p&gt;Please avoid re-editing your comments. Every time you do, an email is sent to those watching this report, which now makes for many emails. I also recommend you set your name to something that isn&apos;t blank.&lt;/p&gt;</comment>
                            <comment id="327515" author="torzod" created="Tue, 30 Aug 2016 15:34:28 +0200"  >&lt;p&gt;1.10,&lt;br/&gt;
1. create default world 00000&lt;br/&gt;
2. re-create it&lt;br/&gt;
3. delete level.dat and level.dat_old from files&lt;br/&gt;
4. create superflat world Copy of 00000&lt;br/&gt;
5. remakes the original, but only the loaded section. around it is superflat&lt;br/&gt;
NOTE: this breaks potions&lt;/p&gt;</comment>
                            <comment id="327514" author="torzod" created="Tue, 30 Aug 2016 15:29:34 +0200"  >&lt;p&gt;1.10, creating a superflat world, then deleting and creating a non-superflat world can &quot;force&quot; villages into weird generations.&lt;/p&gt;</comment>
                            <comment id="327335" author="echoblade" created="Mon, 29 Aug 2016 22:10:43 +0200"  >&lt;p&gt;You can delete the level.dat and level.dat_old of a world folder and recreate a new world under the same name, and then you will get this bug. It&apos;s kind of awesome, though, because you can use it to make survival island maps easily. Try making a world using the seed &quot;Flame&quot;, with the name &quot;Broken Chunks&quot;, exiting, deleting the level.dat and level.dat_old files, and then making the world Flame again, but on a Customized world type where the only biome is Ocean. It&apos;s pretty awesome.&lt;/p&gt;</comment>
                            <comment id="317123" author="bugi74" created="Fri, 24 Jun 2016 15:55:04 +0200"  >&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/browse/MC-63&quot; title=&quot;Player data and region files not written/saved to disk simultaneously, causing item loss/duplication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-63&quot;&gt;MC-63&lt;/a&gt; is sort of similar to &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt;, not to this. At least the way these two issues are split now (and should stay split). &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt; is about the failure of deleting after doing that &lt;em&gt;delete-action&lt;/em&gt;; this is about failing to clean up the possible left-overs when doing &lt;em&gt;create-action&lt;/em&gt;.  Possible crashes during creating a new world are much easier to handle, even when there might be something to clean up first.&lt;/p&gt;

&lt;p&gt;This issue is more important to fix (and easier, too), because it is indeed pretty much impossible to ensure 100% certain deletion (crashes etc.)  Put more simply; fix only this easy one and &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt; (and other causes) will not matter as much (and won&apos;t be seen in the game, only in the filesystem), but if only &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt; is fixed, there will still be issues caused by other reasons (thus not as often).&lt;/p&gt;

&lt;p&gt;(There are still ways to handle the &lt;a href=&quot;https://bugs.mojang.com/browse/MC-63&quot; title=&quot;Player data and region files not written/saved to disk simultaneously, causing item loss/duplication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-63&quot;&gt;MC-63&lt;/a&gt; sort of properly, i.e. either everything gets saved (pure success) or nothing gets saved-and-later-loaded (pure crash), but it gets quite deep in the coding (somewhat common exercise in business critical systems, though), more than suitable to paste here, should someone even get the motivation to try and do such fixes.)&lt;/p&gt;</comment>
                            <comment id="317116" author="farogaming" created="Fri, 24 Jun 2016 15:21:05 +0200"  >&lt;p&gt;I think this is similar to &lt;a href=&quot;https://bugs.mojang.com/browse/MC-63&quot; title=&quot;Player data and region files not written/saved to disk simultaneously, causing item loss/duplication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-63&quot;&gt;MC-63&lt;/a&gt;: The game has to do things after each other and the calculation speed is limited. So if it crashes halfway through saving or deleting, that can&apos;t be fixed in all instances. In this case it could delete the folder before creating something or forbid saving in an existing folder, but e.g. in &lt;a href=&quot;https://bugs.mojang.com/browse/MC-63&quot; title=&quot;Player data and region files not written/saved to disk simultaneously, causing item loss/duplication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-63&quot;&gt;MC-63&lt;/a&gt; there has to be one thing before the other: If it saves the inventory first and then the entites, you can make it crash in between and duplicate items. If it does it the other way around, people who have a crash in between can lose items. One of those two will always happen.&lt;br/&gt;
In this case: If you don&apos;t allow the process javaw.exe to be killed while deleting a world, you could cause other problems if the world deletion goes into an infinite loop for some reason and the program doesn&apos;t want to get quit so that the whole computer lags or whatever.&lt;br/&gt;
In short: If a program gets closed from the outside (crash, task manager, ...), it&apos;s often impossible to prevent some errors.&lt;br/&gt;
(And yes, I&apos;ve understood now how to reproduce.)&lt;/p&gt;</comment>
                            <comment id="317100" author="bugi74" created="Fri, 24 Jun 2016 14:24:39 +0200"  >&lt;p&gt;Read both this and &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt; through (comments, too), that should clarify things a little.&lt;/p&gt;

&lt;p&gt;You asked for a reliably reproducible test for &lt;em&gt;this&lt;/em&gt; issue; putting the files there manually is an easy and reproducible test to check if this issue is fixed or not. (Manually putting the files is like simulating the effect of issue &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt;, which is the typical, but not the only reason for hitting this issue later on.)  NOTE: not all the files of an old world, just such a subset that makes the game think the world is not there, yet old wrong chunks gets rendered after new world gets created on top of the remains.&lt;/p&gt;

&lt;p&gt;When creating a new world, its files are supposed to go into a very specific (and a new) directory. The directory is not supposed to be there, and if it is, there is supposed to be no files in it. Otherwise the world creation should not be allowed to happen to the name used in the first place. (In fact, one could argue that allowing to name the world in a way that leads to issues is already a bug, but such claim is in the territory that can cause heated discussion among developers about bugs, priorities, right and wrong ways to solve things etc. Lets not continue to there.) But since the world creation is allowed to happen with that name, it is, imho, perfectly fine to assume that if there are any files in the way, they are leftovers of a failed removal, or that they are put there manually by a user, and if a user is putting files in such a place where user&apos;s manipulation is not welcome (taking backup needs only copying the whole directory, not individual files inside it), it can be assumed he knows what he is doing and is thus responsible for the fate of those files - the game does not need to account for that kind of messing with its operation.&lt;/p&gt;

&lt;p&gt;A really fancy fix for this issue would actually check what kinds of files are there, and only remove the ones that are related to this game, and leave other files as is. I have no idea what other kinds of files users could possibly want to put in there, though... perhaps some sort of README-file or such (though such would likely be needed only when dropping in a full world for playing, and thus world creation is not needed or wanted). But in any case, that kind of fancy change would be way beyond just a bugfix, and belongs to wherever they want the feature requests to be put and forgotten.&lt;/p&gt;</comment>
                            <comment id="317098" author="farogaming" created="Fri, 24 Jun 2016 14:06:50 +0200"  >&lt;p&gt;If you put these files in the folder manually, why should they get deleted? I don&apos;t see why you should do that except if you want these files there.&lt;/p&gt;</comment>
                            <comment id="317058" author="bugi74" created="Fri, 24 Jun 2016 09:34:08 +0200"  >&lt;p&gt;Fabian:&lt;br/&gt;
Since this issue is about deleting random left-overs before creating new world into existing directory, it is easy to simulate a situation where the previous world deletion has failed: simply backup random files from a test world before deleting it, delete it, create the directory again if necessary, then copy those backed up random files back into that directory.  Create a new world with the same name and compare results, i.e. are the wrong files still in the save directory.&lt;/p&gt;

&lt;p&gt;For continued testing, simply store the collection of random files and their world-directory into a zip-file and re-plant them over the deleted world and re-create...&lt;/p&gt;

&lt;p&gt;(I didn&apos;t test the sequence above, making it up from my memory, but it should give the idea close enough.)&lt;/p&gt;

&lt;p&gt;The related &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt; is much more difficult to test, but luckily this is the more important issue to be fixed and can be tested easily. 3.5 years gone now, plenty of duplicates (more than votes in this issue), nearly trivial to fix and an (somewhat bad) example code given... &lt;em&gt;sigh&lt;/em&gt;...&lt;/p&gt;</comment>
                            <comment id="317022" author="farogaming" created="Fri, 24 Jun 2016 03:00:54 +0200"  >&lt;p&gt;Does anyone have tips how to reproduce this a bit reliably?&lt;/p&gt;</comment>
                            <comment id="304010" author="bugi74" created="Wed, 11 May 2016 10:03:16 +0200"  >&lt;p&gt;Lawrence G. you could have read some comments before adding yours, it is quite often useful. E.g. the one just two comments before yours. Or the 8th from the start... Basically, the reasons have been known for years, we&apos;re just waiting for the fix.&lt;/p&gt;</comment>
                            <comment id="303971" author="lr g." created="Wed, 11 May 2016 04:55:53 +0200"  >&lt;p&gt;I think I know the bug: When you create a world and delete it, Minecraft may not be able to delete some chunk files so when you create a new world with same world name and directory name (in &lt;tt&gt;saves&lt;/tt&gt; folder), it will load the chunks in the folder of the world in the &lt;tt&gt;saves&lt;/tt&gt; folder.&lt;/p&gt;

&lt;p&gt;I suggest Minecraft developers that if you create a world, it will have different directory name in the &lt;tt&gt;saves&lt;/tt&gt; folder (like in &lt;tt&gt;Pocket Edition&lt;/tt&gt;).&lt;/p&gt;</comment>
                            <comment id="297550" author="jonathanhaas" created="Wed, 30 Mar 2016 18:54:54 +0200"  >&lt;p&gt;@Deano: This bug is bad, but it&apos;s not awful and it doesn&apos;t plague us for 4 years or something like that. There is a very simple workaround: Just don&apos;t reuse world names, if you create a new world, use a name you didn&apos;t used before (append a digit or whatever). Then you should be fine.&lt;/p&gt;</comment>
                            <comment id="297538" author="bugi74" created="Wed, 30 Mar 2016 17:44:38 +0200"  >&lt;p&gt;Michael Connel, this issue is quite easily fixable, just see my comment made 3 years ago. Granted it is quite awful piece of code, but it was just an example. (I do not expect mojang to solve the issue with that code, it just proves it can be fixed with code.)&lt;/p&gt;

&lt;p&gt;The way how some operating systems/file systems delete files has nothing to do with this issue. It has more to do with how minecraft does the deletion, server vs. client architecture, and in some cases too quick exit. Note well the related issue &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="297457" author="mike10221999" created="Wed, 30 Mar 2016 13:12:55 +0200"  >&lt;p&gt;I&apos;m not sure this is fixable from a developers&apos; standpoint.&lt;/p&gt;

&lt;p&gt;The but occurs by deleting a world and making a new one that is named the same thing (as the desc says).&lt;/p&gt;

&lt;p&gt;It has to do with the way computers delete things. When a file is deleted, it isn&apos;t actually deleted, it&apos;s just allowed to be overwritten. So if you create a new world right AFTER deleting one of this same name, it will create the world in the same place on the hard drive, and thus it will pull some chunks from the deleted world.&lt;/p&gt;

&lt;p&gt;So that&apos;s why it isn&apos;t fixable- at least for the developers.&lt;/p&gt;

&lt;p&gt;There are workarounds (like &apos;permanent&apos; deletion), but they are complicated.&lt;/p&gt;</comment>
                            <comment id="297244" author="jonbugging" created="Tue, 29 Mar 2016 00:00:28 +0200"  >&lt;p&gt;This is awkward... I thought this was removed...&lt;/p&gt;</comment>
                            <comment id="296663" author="dancinghippos99" created="Fri, 25 Mar 2016 16:20:13 +0100"  >&lt;p&gt;Confirmed in 1.9. Either this or a related bug. Random chunks relocated upon reloading an existing world.&lt;/p&gt;</comment>
                            <comment id="282880" author="greenviceroy" created="Thu, 4 Feb 2016 03:37:36 +0100"  >&lt;p&gt;I got a screenshot of it.&lt;/p&gt;</comment>
                            <comment id="282878" author="greenviceroy" created="Thu, 4 Feb 2016 03:31:44 +0100"  >&lt;p&gt;Confirmed in 1.8.9. I generated a new superflat world with the dirt preset changed to 50, so it can be deeper. I teleported to 0 62 0, the center of the world, set my spawn, and started building. However, I soon saw a large structure in the distance, and I realized that it was a chunk. I saw a bunch of them, and it was really scary. I deleted that world. The thing is, I had created a world before this, but I forgot to set it to superflat and creative mode. It was normal and was in survival. I suppose that the chunks didn&apos;t unload, causing them to load into the superflat world with the exact same name. There was a lake in one of the chunks, and in the superflat world it didn&apos;t flow over the edge, so I suppose the chunks just didn&apos;t unload when deleting and recreating the world in superflat.&lt;/p&gt;</comment>
                            <comment id="242238" author="lewmas fain" created="Wed, 12 Aug 2015 19:51:17 +0200"  >&lt;p&gt;I can confirm it for 15w32c&lt;/p&gt;</comment>
                            <comment id="227449" author="marcono1234" created="Sat, 16 May 2015 17:56:55 +0200"  >&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=gerottinho&quot; class=&quot;user-hover&quot; rel=&quot;gerottinho&quot;&gt;gerottinho&lt;/a&gt; probably because this report here contained the cause for this bug. It happens sometimes that Mods close older reports because they contained less information&lt;/p&gt;</comment>
                            <comment id="227445" author="gerottinho" created="Sat, 16 May 2015 17:40:53 +0200"  >&lt;p&gt;I love how my report on &lt;a href=&quot;https://bugs.mojang.com/browse/MC-204&quot; title=&quot;Error - Superflat&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-204&quot;&gt;&lt;del&gt;MC-204&lt;/del&gt;&lt;/a&gt; is older than this one but still got closed for the reason &quot;duplicated&quot;. I&apos;m actually quite surprised I accessed randomly &lt;a href=&quot;https://bugs.mojang.com/browse/MC-204&quot; title=&quot;Error - Superflat&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-204&quot;&gt;&lt;del&gt;MC-204&lt;/del&gt;&lt;/a&gt; and saw I was the reporter, too.&lt;/p&gt;</comment>
                            <comment id="204865" author="kingsupernova" created="Fri, 24 Oct 2014 02:45:20 +0200"  >&lt;p&gt;Confirmed in 1.8.1-pre3&lt;/p&gt;</comment>
                            <comment id="195500" author="noproct" created="Sat, 30 Aug 2014 15:55:01 +0200"  >&lt;p&gt;I have one chunk in my main SSP world, next to my guardian farm in a deep oceanthat does not belong there. It seems that the biome info is overwritten because the chunk is clearly a forrest but every block on it is a deep ocean biome.&lt;/p&gt;</comment>
                            <comment id="180684" author="tbest3112" created="Sun, 27 Jul 2014 17:39:43 +0200"  >&lt;p&gt;Confirmed 14w30c&lt;/p&gt;</comment>
                            <comment id="178134" author="yarrmateys" created="Wed, 23 Jul 2014 15:19:08 +0200"  >&lt;p&gt;one way to circumvent it until fixed would be to rename the newly created world on creation if previous wasn&apos;t deleted completely and its folder/files still exist.&lt;/p&gt;

&lt;p&gt;say, you make world called &quot;new world&quot;, then delete it (but deletion fails) and make a new one called the same. instead of calling its folder &quot;new world&quot; too and causing the bug, just auto rename it to &quot;new world_1&quot; or involve a date+time, like &quot;new world_20140723151905&quot; to prevent multiple attempts to create the same name.&lt;/p&gt;

&lt;p&gt;that way even if the world fails to delete, new one won&apos;t be able to overwrite its remains, taking some of its chunks in since it&apos;ll go to a different folder.&lt;/p&gt;

&lt;p&gt;the remaining one could be scheduled to be deleted on next minecraft launch, and if it still fails then, reschedule for next and keep doing it until successful. one pc reset later the folder will be finally freed and will delete normally.&lt;/p&gt;</comment>
                            <comment id="177828" author="bugi74" created="Tue, 22 Jul 2014 10:14:09 +0200"  >&lt;p&gt;Blah, Andrew and Bruce, and Sonic:&lt;br/&gt;
Read my comments in both this issue and &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Both are fixable, and can be quite easily at least improved so much that we wouldn&apos;t get 180 duplicates... (And Searge&apos;s comment in &lt;a href=&quot;https://bugs.mojang.com/browse/MC-62627&quot; title=&quot;AMPLIFIED terrain generating in Default terrain world&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-62627&quot;&gt;&lt;del&gt;MC-62627&lt;/del&gt;&lt;/a&gt; in no way claims that these are not fixable, he merely states the reason for that issue to be this bug.)&lt;/li&gt;
	&lt;li&gt;The issue is &lt;em&gt;both&lt;/em&gt; failing to delete a world properly at the time of deletion, and failing to delete the remains at the time of creating a new one. (The first is obviously good to have, the latter is a must.)&lt;/li&gt;
	&lt;li&gt;&quot;Don&apos;t do that then&quot; is a joke, not a valid solution for these issues. These issues are not user errors, but coding bugs.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;There are, in a way, two issues caused by one failure. However, both issues should be fixed as the &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt;&apos;s &quot;worlds will not delete&quot; can not be 100% ensured in e.g. crash situations (power outages etc.). The world deletion &lt;em&gt;can&lt;/em&gt; be made more robust (I&apos;ve even provided some suggestions of tested fixes). The lingering worlds &lt;em&gt;can&lt;/em&gt; be deleted (100%) properly before taking them into new use (I&apos;ve even provided some tested, though ugly code fixes).&lt;/p&gt;

&lt;p&gt;These issues have now been, and has been for last 1.5 years, only waiting for Mojang dev&apos;s to adapt those fixes to their code (or make even better fixes if they want).&lt;/p&gt;</comment>
                            <comment id="177814" author="kumasasa" created="Tue, 22 Jul 2014 08:00:21 +0200"  >&lt;p&gt;@&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=duckofduckness&quot; class=&quot;user-hover&quot; rel=&quot;duckofduckness&quot;&gt;duckofduckness&lt;/a&gt;: It&apos;s the server still saving the world files while the client tries to delete the files:&lt;/p&gt;
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;[00:19:42] [Server thread/INFO]: Saving chunks &lt;span class=&quot;code-keyword&quot;&gt;for&lt;/span&gt; level &lt;span class=&quot;code-quote&quot;&gt;&apos;Flatworld6&apos;&lt;/span&gt;/Overworld
[00:19:42] [Client thread/INFO]: Deleting level Flatworld6
[00:19:42] [Client thread/INFO]: Attempt 1...
[00:19:42] [Client thread/WARN]: Couldn&apos;t delete file C:\Users\User\AppData\Roaming\.minecraft\saves\Flatworld6\region\r.-1.0.mca
[00:19:42] [Client thread/WARN]: Couldn&apos;t delete directory C:\Users\User\AppData\Roaming\.minecraft\saves\Flatworld6\region
[00:19:42] [Client thread/WARN]: Unsuccessful in deleting contents.
[00:19:42] [Server thread/INFO]: Saving chunks &lt;span class=&quot;code-keyword&quot;&gt;for&lt;/span&gt; level &lt;span class=&quot;code-quote&quot;&gt;&apos;Flatworld6&apos;&lt;/span&gt;/Nether
[00:19:42] [Server thread/INFO]: Saving chunks &lt;span class=&quot;code-keyword&quot;&gt;for&lt;/span&gt; level &lt;span class=&quot;code-quote&quot;&gt;&apos;Flatworld6&apos;&lt;/span&gt;/The End
[00:19:43] [Client thread/INFO]: Attempt 2...
[00:19:43] [Client thread/WARN]: Couldn&apos;t delete file C:\Users\User\AppData\Roaming\.minecraft\saves\Flatworld6\region\r.-1.0.mca
[00:19:43] [Client thread/WARN]: Couldn&apos;t delete directory C:\Users\User\AppData\Roaming\.minecraft\saves\Flatworld6\region
[00:19:43] [Client thread/WARN]: Unsuccessful in deleting contents.
[00:19:43] [Client thread/INFO]: Attempt 3...
[00:19:43] [Client thread/WARN]: Couldn&apos;t delete file C:\Users\User\AppData\Roaming\.minecraft\saves\Flatworld6\region\r.-1.0.mca
[00:19:43] [Client thread/WARN]: Couldn&apos;t delete directory C:\Users\User\AppData\Roaming\.minecraft\saves\Flatworld6\region
[00:19:43] [Client thread/WARN]: Unsuccessful in deleting contents.
[00:19:44] [Client thread/INFO]: Attempt 4...
[00:19:44] [Client thread/WARN]: Couldn&apos;t delete file C:\Users\User\AppData\Roaming\.minecraft\saves\Flatworld6\region\r.-1.0.mca
[00:19:44] [Client thread/WARN]: Couldn&apos;t delete directory C:\Users\User\AppData\Roaming\.minecraft\saves\Flatworld6\region
[00:19:44] [Client thread/WARN]: Unsuccessful in deleting contents.
[00:19:44] [Client thread/INFO]: Attempt 5...
[00:19:44] [Client thread/WARN]: Couldn&apos;t delete file C:\Users\User\AppData\Roaming\.minecraft\saves\Flatworld6\region\r.-1.0.mca
[00:19:44] [Client thread/WARN]: Couldn&apos;t delete directory C:\Users\User\AppData\Roaming\.minecraft\saves\Flatworld6\region
[00:19:44] [Client thread/WARN]: Unsuccessful in deleting contents.
[00:19:57] [Server thread/INFO]: Starting integrated minecraft server version 14w29b
&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;</comment>
                            <comment id="177781" author="growfybruce" created="Tue, 22 Jul 2014 01:10:46 +0200"  >&lt;p&gt;Andrew, look at the log on &lt;a href=&quot;https://bugs.mojang.com/browse/MC-315?focusedCommentId=137723&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-137723&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;my comment&lt;/a&gt;. The error being reported is:&lt;/p&gt;
&lt;div class=&quot;preformatted panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;preformattedContent panelContent&quot;&gt;
&lt;pre&gt;[20:24:11] [Server thread/ERROR]: Couldn&apos;t save chunk; already in use by another instance of Minecraft?
&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;Basically, old chunks from one world can&apos;t be overwritten by worldgen in the next.&lt;/p&gt;

&lt;p&gt;Blah, I&apos;d accept &quot;Don&apos;t do that then&quot; as a bugfix...&lt;/p&gt;</comment>
                            <comment id="177772" author="duckofduckness" created="Tue, 22 Jul 2014 00:29:50 +0200"  >&lt;p&gt;So the problem is actually with the world/chunk generation and not old files not being deleted properly?&lt;/p&gt;</comment>
                            <comment id="177716" author="themeaningofblah" created="Mon, 21 Jul 2014 21:49:35 +0200"  >&lt;p&gt;Unfixable. Searge&apos;s comment from &lt;a href=&quot;https://bugs.mojang.com/browse/MC-62627&quot; title=&quot;AMPLIFIED terrain generating in Default terrain world&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-62627&quot;&gt;&lt;del&gt;MC-62627&lt;/del&gt;&lt;/a&gt;:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;Leaving a world, then immediately deleting it and creating a new one with the same name can, in some cases, cause issues with chunk generation.&lt;/p&gt;&lt;/blockquote&gt;
</comment>
                            <comment id="157094" author="medivalgirl858" created="Sun, 11 May 2014 17:25:48 +0200"  >&lt;p&gt;happened to me 2, but when i first spawned it was nt there.. 2 weeks later its like random walls grew. And now my dirt is retextured to look like its glowing. &lt;/p&gt;</comment>
                            <comment id="137729" author="bugi74" created="Sun, 2 Feb 2014 22:16:04 +0100"  >&lt;p&gt;Note, the sequence used by Bruce also indicates that &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt; affects 14w05b (couple more versions than the latest reported). The delete and recreate -sequence, when causing issues, automatically confirms both issues (as both the deletion fails at the time of deletion, and no attempt to clear the old dir is made at the time of creation).&lt;/p&gt;</comment>
                            <comment id="137723" author="growfybruce" created="Sun, 2 Feb 2014 22:06:15 +0100"  >&lt;p&gt;Confirmed in 14w05b (OSX 10.8.5, &lt;a href=&quot;https://bugs.mojang.com/secure/attachment/55469/latest.log&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;log attached&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;Just accidentally created a checkerboard of two different worlds due to the deletion of the previous world failing to complete before a new world (with the same name) was created.&lt;/p&gt;

&lt;p&gt;I meant to create a new Creative world but created a Survival world by mistake (as &quot;New World&quot;). I quit out to the menu, deleted the Survival world and created a Creative one instead (also &quot;New World&quot;). Creative world has a mixture of chunks from the deleted world and the world that actually goes with the seed given by &lt;tt&gt;/seed&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Edit:&lt;/b&gt; Actually, this may be an instance of &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt; instead.&lt;/p&gt;</comment>
                            <comment id="134793" author="kumasasa" created="Sat, 25 Jan 2014 01:32:27 +0100"  >&lt;p&gt;Logfile in &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526?focusedCommentId=134792&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-134792&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://bugs.mojang.com/browse/MC-526?focusedCommentId=134792&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-134792&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="134745" author="jar_" created="Sat, 25 Jan 2014 00:02:10 +0100"  >&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=kumasasa&quot; class=&quot;user-hover&quot; rel=&quot;kumasasa&quot;&gt;kumasasa&lt;/a&gt;: Can&apos;t get it to work right now, I&apos;ll try again tomorrow.&lt;/p&gt;</comment>
                            <comment id="134642" author="kumasasa" created="Fri, 24 Jan 2014 21:36:17 +0100"  >&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=Jar_&quot; class=&quot;user-hover&quot; rel=&quot;Jar_&quot;&gt;Jar_&lt;/a&gt;: Please attach the development console when having this issue.&lt;/p&gt;</comment>
                            <comment id="133863" author="jar_" created="Thu, 23 Jan 2014 14:36:02 +0100"  >&lt;p&gt;This is still an issue in &lt;em&gt;Minecraft version&lt;/em&gt; &lt;b&gt;14w03b&lt;/b&gt;.&lt;/p&gt;</comment>
                            <comment id="109928" author="kumasasa" created="Tue, 8 Oct 2013 21:56:01 +0200"  >&lt;p&gt;Markku, you are absolutely right.&lt;/p&gt;</comment>
                            <comment id="109922" author="bugi74" created="Tue, 8 Oct 2013 21:29:40 +0200"  >&lt;p&gt;Actually, it does justify reopening &lt;em&gt;this&lt;/em&gt; issue, but not the related &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt;. This issue is now profiled more about deleting any garbage at the time of taking a possible old folder to be reused - whatever the reason for having that garbage there.&lt;/p&gt;

&lt;p&gt;My crude fix shown in a previous comment does just that; even if some ancient stuff is around, they are cleared out first. That action is also necessary even if the deletion process is fixed, as there could still be events which interrupt deletion, like crash or power-down etc. and those can not be avoided or handled at deletion time. They &lt;em&gt;must&lt;/em&gt; be handled later, at the time of creating a new world. (A fancy fix might occasionally try to check and cleanup folders that are obviously no longer in use but have some garbage...)&lt;/p&gt;

&lt;p&gt;The &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt; is purely about the deletion itself, when the action is started by the player, but fails to complete (for reasons that can be fixed and avoided). No need to even try to create another world by the same name. This &lt;a href=&quot;https://bugs.mojang.com/browse/MC-315&quot; title=&quot;Chunks do not delete properly remaining in a newly created world if the same world name is reused&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-315&quot;&gt;&lt;del&gt;MC-315&lt;/del&gt;&lt;/a&gt; is just the most common consequence of the &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt;. But not the only consequence for it, and there are other reasons for &lt;a href=&quot;https://bugs.mojang.com/browse/MC-315&quot; title=&quot;Chunks do not delete properly remaining in a newly created world if the same world name is reused&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-315&quot;&gt;&lt;del&gt;MC-315&lt;/del&gt;&lt;/a&gt; than having &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt; first. (Thus, the need to have these separate issues for them.)&lt;/p&gt;</comment>
                            <comment id="109895" author="kumasasa" created="Tue, 8 Oct 2013 20:17:28 +0200"  >&lt;p&gt;&lt;del&gt;&lt;a href=&quot;https://bugs.mojang.com/browse/MC-34303&quot; title=&quot;Square Oceans/Chunk Generation Errors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-34303&quot;&gt;&lt;del&gt;MC-34303&lt;/del&gt;&lt;/a&gt; does not necessarily justify a reopening of this ticket, if there are still old region files laying around on the harddisk (by &lt;em&gt;this&lt;/em&gt; bug in older versions), then creating the world with the old name in 13w39b will of course show this effect too.&lt;/del&gt;&lt;/p&gt;</comment>
                            <comment id="109846" author="cubethethird" created="Tue, 8 Oct 2013 15:15:08 +0200"  >&lt;p&gt;Reopening due to &lt;a href=&quot;https://bugs.mojang.com/browse/MC-34303&quot; title=&quot;Square Oceans/Chunk Generation Errors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-34303&quot;&gt;&lt;del&gt;MC-34303&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="104385" author="evilseph" created="Thu, 19 Sep 2013 15:39:30 +0200"  >&lt;p&gt;Potentially fixed this issue. I&apos;m not able to reproduce it so I&apos;m not 100% sure. Please test and let me know, thanks &lt;img class=&quot;emoticon&quot; src=&quot;https://bugs.mojang.com/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="99126" author="moriki" created="Fri, 16 Aug 2013 21:16:20 +0200"  >&lt;p&gt;Im having a similar problem with jungle biomes.&lt;/p&gt;</comment>
                            <comment id="87309" author="mike10221999" created="Tue, 9 Jul 2013 21:15:06 +0200"  >&lt;p&gt;Please add that it affects Mac OSX.&lt;/p&gt;</comment>
                            <comment id="84133" author="bugi74" created="Sat, 6 Jul 2013 09:23:30 +0200"  >&lt;p&gt;@crazyman: those steps (as described) are not always enough, as timing is part of the problem. Better description for reproduction in the comments of the related &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt;. (The crucial thing is to do the step from leave world -&amp;gt; delete world quickly; on my machine (SSD drive etc) I have to even exercise a bit (e.g. to know to move mouse cursor to proper spot even before I can see the button to be pressed) in order to be quick enough.)&lt;/p&gt;

&lt;p&gt;Apart from the user error part, Steelcrow&apos;s comment was otherwise correct, and was one of the comments that allowed me to find the problem code quicker.&lt;/p&gt;

&lt;p&gt;As another note, there are more duplicates than votes for this issue. Sigh.&lt;/p&gt;</comment>
                            <comment id="84115" author="crazyman1001" created="Sat, 6 Jul 2013 09:10:34 +0200"  >&lt;p&gt;@SteelCrow we are not looking for user error.&lt;br/&gt;
Steps to reproduce:&lt;br/&gt;
1. Make a world&lt;br/&gt;
2. Leave world&lt;br/&gt;
3. Delete world (singleplayer ==&amp;gt; select world ==&amp;gt; press delete world ==&amp;gt; Are you sure? YES)&lt;br/&gt;
4. Create new world with exactly same world and directory name.&lt;br/&gt;
5. Old chunks remains in new world.&lt;br/&gt;
This is &lt;b&gt;not&lt;/b&gt; user error, this is error in the game code. I&apos;m waiting that someone from mojang fixes this.&lt;br/&gt;
In mean time, let&apos;s just cuddle :3&lt;/p&gt;</comment>
                            <comment id="84111" author="crazyman1001" created="Sat, 6 Jul 2013 09:02:32 +0200"  >&lt;p&gt;Confirmed on 1.1 (superflat introduced) - prerelease 1.6.2&lt;br/&gt;
this bug &lt;b&gt;ANNOYS ME&lt;/b&gt;!&lt;/p&gt;</comment>
                            <comment id="76552" author="thunderbolt121" created="Mon, 24 Jun 2013 06:32:40 +0200"  >&lt;p&gt;Confirmed in 13w25c&lt;/p&gt;</comment>
                            <comment id="71562" author="thunderbolt121" created="Thu, 6 Jun 2013 10:06:08 +0200"  >&lt;p&gt;it did it to me in 13w22a&lt;/p&gt;</comment>
                            <comment id="70901" author="deepicness12345" created="Wed, 5 Jun 2013 02:36:34 +0200"  >&lt;p&gt;Confirmed in 13w22a&lt;/p&gt;</comment>
                            <comment id="69017" author="thomas5020" created="Sun, 26 May 2013 23:18:44 +0200"  >&lt;p&gt;I got this with an extreme hills (which for some reason had jungle trees on it...!?) in 1.5.2&lt;/p&gt;</comment>
                            <comment id="66994" author="m124367" created="Fri, 17 May 2013 16:21:26 +0200"  >&lt;p&gt;I had this once but than th other way around with the superflat in the middle and default around it...&lt;br/&gt;
looked like &apos;the end of the flatlands&apos;&lt;/p&gt;</comment>
                            <comment id="60585" author="miner99999999" created="Wed, 17 Apr 2013 14:15:54 +0200"  >&lt;p&gt;Guys, My brother found it he has the one who said me to post it. Sorry!&lt;/p&gt;</comment>
                            <comment id="46220" author="bugi74" created="Sun, 17 Feb 2013 12:42:27 +0100"  >&lt;p&gt;&lt;b&gt;Crude fix&lt;/b&gt;&lt;br/&gt;
MCP naming...&lt;/p&gt;
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeHeader panelHeader&quot; style=&quot;border-bottom-width: 1px;&quot;&gt;&lt;b&gt;Minecraft.launchIntegratedServer()&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;    ...
    ISaveHandler var4 = &lt;span class=&quot;code-keyword&quot;&gt;this&lt;/span&gt;.saveLoader.getSaveLoader(dirName, &lt;span class=&quot;code-keyword&quot;&gt;false&lt;/span&gt;);
    WorldInfo var5 = var4.loadWorldInfo();

    &lt;span class=&quot;code-keyword&quot;&gt;if&lt;/span&gt; (var5 == &lt;span class=&quot;code-keyword&quot;&gt;null&lt;/span&gt; &amp;amp;&amp;amp; par3WorldSettings != &lt;span class=&quot;code-keyword&quot;&gt;null&lt;/span&gt;) {
        &lt;span class=&quot;code-comment&quot;&gt;// A &lt;span class=&quot;code-keyword&quot;&gt;new&lt;/span&gt; world, ensure deletion of possible old junk and reinitialize var4:
&lt;/span&gt;        &lt;span class=&quot;code-keyword&quot;&gt;this&lt;/span&gt;.saveLoader.deleteWorldDirectory(dirName);         &lt;span class=&quot;code-comment&quot;&gt;// ADDED
&lt;/span&gt;        var4 = &lt;span class=&quot;code-keyword&quot;&gt;this&lt;/span&gt;.saveLoader.getSaveLoader(dirName, &lt;span class=&quot;code-keyword&quot;&gt;false&lt;/span&gt;);  &lt;span class=&quot;code-comment&quot;&gt;// ADDED
&lt;/span&gt;            
        &lt;span class=&quot;code-keyword&quot;&gt;this&lt;/span&gt;.statFileWriter.readStat(StatList.createWorldStat, 1);
        var5 = &lt;span class=&quot;code-keyword&quot;&gt;new&lt;/span&gt; WorldInfo(par3WorldSettings, dirName);
        var4.saveWorldInfo(var5);
    }
    ...
&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;It is kinda bad coding, but I am trying to keep using existing methods. The ugliness comes from that method handling both new and existing worlds, and it needs to init and use both var4 and var5 in order to know if the world is new. But by that time those calls have already created the world directory and a file, which the deletion then immediately remove. Thus it needs to redo the var4 stuff.&lt;/p&gt;

&lt;p&gt;The proper fix would be add a new method that specifically checks the existence of world save left-overs and then cleans them up, and use that method from those places which create new worlds (and only create, not open existing ones).&lt;/p&gt;

&lt;p&gt;Tested on 1.4.7, works wonders. My messed up results from testing &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt; and sheep color testing, and even manually &quot;broken&quot; world save directories were all handled correctly. That is, the world creation first wiped the remains of the old directory (confirmed by watching the console and checking that marker files disappeared) before generating the new world with the same directory name.&lt;/p&gt;</comment>
                            <comment id="44005" author="yarrmateys" created="Wed, 6 Feb 2013 19:03:00 +0100"  >&lt;p&gt;one way to fix it could be probably to force minecraft to check for any world files/region folder/DIM* folders present when creating a new world, before world generation and delete them before being allowed to generate new ones. in case any files are inaccessible/read only show an error and return to world creation menu.&lt;/p&gt;

&lt;p&gt;unless that&apos;s already happening and didn&apos;t help.&lt;/p&gt;</comment>
                            <comment id="39999" author="candoran2" created="Sat, 26 Jan 2013 14:38:32 +0100"  >&lt;p&gt;It is still in 13w04, I can comfirm it.&lt;/p&gt;</comment>
                            <comment id="36515" author="kumasasa" created="Sun, 13 Jan 2013 17:19:24 +0100"  >&lt;p&gt;This issue is a follow up of &lt;a href=&quot;https://bugs.mojang.com/browse/MC-526&quot; title=&quot;Worlds will not delete&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-526&quot;&gt;&lt;del&gt;MC-526&lt;/del&gt;&lt;/a&gt; &lt;/p&gt;</comment>
                            <comment id="28770" author="miner99999999" created="Sun, 16 Dec 2012 13:03:33 +0100"  >&lt;p&gt;I had it on 1.2.5.&lt;/p&gt;
</comment>
                            <comment id="17682" author="egroeg9" created="Sat, 3 Nov 2012 17:07:24 +0100"  >&lt;p&gt;Ive Seen This Aswell Exept The Biome Was Desert And There Were Jungle Trees and It Was Snowing!!??&lt;/p&gt;</comment>
                            <comment id="14903" author="steelcrow" created="Mon, 29 Oct 2012 03:59:51 +0100"  >&lt;p&gt;Commonly seem when the world name is reused.  Old world didn&apos;t have time to delete and new one used the same folder name as the old which contained undeleted chunks. We&apos;re looking at user error.&lt;/p&gt;</comment>
                            <comment id="12892" author="randoomjd" created="Thu, 25 Oct 2012 03:50:01 +0200"  >&lt;p&gt;Have you tried deleting these incorrectly generated chunks via some third-party program such as MCedit. From the results of this test you could determine whether this is a slight flaw with flatland generation or the game neglecting to read the NBT tags of the save before generating these chunks and therefore generating them as it would with a normal world. This also seams to be the same issue as &lt;a href=&quot;https://bugs.mojang.com/browse/MC-204&quot; title=&quot;Error - Superflat&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-204&quot;&gt;&lt;del&gt;MC-204&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                    </comments>
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