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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-3524] Structure related mobs do not spawn in flat type world generation</title>
                <link>https://bugs.mojang.com/browse/MC-3524</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;Structure related mobs can not spawn in superflat worlds.&lt;br/&gt;
This is true for:&lt;/p&gt;


&lt;ul&gt;
	&lt;li&gt;Pillager&lt;/li&gt;
	&lt;li&gt;Witches&lt;/li&gt;
	&lt;li&gt;Guardians&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Steps taken to confirm this:&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Forward Confirmation&lt;/b&gt;&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Generated World on any Seed with Superflat (flat) World Generation and included all available structures (default spawn ratio)&lt;/li&gt;
	&lt;li&gt;Using admist and /locate to find nearest structure, teleport to it, and confirm no spawning&lt;/li&gt;
	&lt;li&gt;Save and exit.&lt;/li&gt;
	&lt;li&gt;Using NBTExplorer change world generation type from &apos;flat&apos; to &apos;default&apos;&lt;/li&gt;
	&lt;li&gt;Join world and confirm spawning entities&lt;/li&gt;
	&lt;li&gt;Confirm changed world-gen by loading new chunks&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&lt;b&gt;Backward Confirmation&lt;/b&gt;&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Generated new default World on any Seed&lt;/li&gt;
	&lt;li&gt;Using /locate to find and teleport to nearest structure. Confirm through admist as well.&lt;/li&gt;
	&lt;li&gt;Save and exit.&lt;/li&gt;
	&lt;li&gt;Using NBTExplorer change world generation type from &apos;default&apos; to &apos;flat&apos;&lt;/li&gt;
	&lt;li&gt;Join world and kill all Entities (except player) to confirm no spawning entities.&lt;/li&gt;
	&lt;li&gt;Confirm changed world-gen by loading new chunks&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;In addition, seed-changes were tested, as well as importing confirmed-working chunks into superflat world and manually creating structures through NBTExplorer.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;In all these cases structure entities consistently did not spawn while level.dat contained &apos;flat&apos; - type world generation.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="15597">MC-3524</key>
            <summary>Structure related mobs do not spawn in flat type world generation</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="1">Fixed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="megasmurf">Fredrik Olsson</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Nov 2012 09:14:10 +0100</created>
                <updated>Mon, 18 Jul 2022 02:11:07 +0200</updated>
                            <resolved>Fri, 18 Feb 2022 14:40:23 +0100</resolved>
                                    <version>Minecraft 1.4.5</version>
                    <version>Minecraft 1.5</version>
                    <version>Minecraft 1.6.4</version>
                    <version>Minecraft 1.7.2</version>
                    <version>Minecraft 1.8</version>
                    <version>Minecraft 1.8.1-pre3</version>
                    <version>Minecraft 1.8.4</version>
                    <version>Minecraft 1.8.8</version>
                    <version>Minecraft 15w45a</version>
                    <version>Minecraft 1.10.2</version>
                    <version>Minecraft 1.11.2</version>
                    <version>1.15.1</version>
                    <version>1.15.2</version>
                    <version>20w12a</version>
                    <version>20w16a</version>
                    <version>1.16 Pre-release 2</version>
                    <version>1.16 Release Candidate 1</version>
                    <version>1.16</version>
                    <version>1.16.1</version>
                    <version>20w28a</version>
                    <version>1.16.3</version>
                    <version>21w07a</version>
                    <version>21w15a</version>
                    <version>21w20a</version>
                    <version>1.17 Pre-release 2</version>
                    <version>1.17</version>
                    <version>1.17.1 Release Candidate 1</version>
                    <version>1.17.1</version>
                    <version>21w38a</version>
                    <version>1.18</version>
                    <version>1.18.1</version>
                    <version>22w06a</version>
                                    <fixVersion>1.18.2 Pre-release 1</fixVersion>
                                                        <votes>38</votes>
                                    <watches>22</watches>
                                                                            <comments>
                            <comment id="1139696" author="JIRAUSER704397" created="Sun, 6 Feb 2022 13:43:40 +0100"  >&lt;p&gt;Still the case in 1.18.1&lt;/p&gt;</comment>
                            <comment id="997004" author="vladim&#237;r" created="Fri, 21 May 2021 06:57:21 +0200"  >&lt;p&gt;Can confirm for 21w20a&lt;/p&gt;</comment>
                            <comment id="760083" author="vladim&#237;r" created="Thu, 9 Jul 2020 08:00:28 +0200"  >&lt;p&gt;In 1.16.1 and 20w28a&lt;/p&gt;</comment>
                            <comment id="722594" author="alexis.a.evelyn+minecraft@gmail.com" created="Mon, 8 Jun 2020 11:43:39 +0200"  >&lt;p&gt;Can confirm, this is still an issue for 1.16 pre-2. I spent a few hours pouring over nbt data trying to figure out why my outpost wasn&apos;t working and weeded it out to world type. Also, I tried a superflat preset explicitely telling the game to generate the outposts to find out it didn&apos;t work anyway.&lt;/p&gt;</comment>
                            <comment id="651952" author="vladim&#237;r" created="Sun, 22 Mar 2020 19:14:04 +0100"  >&lt;p&gt;Confirmed for 1.15.2 and 20w12a&lt;/p&gt;</comment>
                            <comment id="623476" author="jackmember" created="Sat, 11 Jan 2020 21:17:03 +0100"  >&lt;p&gt;&lt;del&gt;Testing regarding this issue, this issue is superseded by issue&lt;/del&gt;&#160;&lt;del&gt;&lt;a href=&quot;https://bugs.mojang.com/browse/MC-169728&quot; title=&quot;Structure related mobs do not spawn in flat type world generation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-169728&quot;&gt;&lt;del&gt;MC-169728&lt;/del&gt;&lt;/a&gt;&lt;/del&gt;&lt;/p&gt;

&lt;p&gt;Edit: No longer the case, as moderator merged posts.&lt;/p&gt;</comment>
                            <comment id="583980" author="dracconis69" created="Sun, 15 Sep 2019 19:13:54 +0200"  >&lt;p&gt;Can confirm that this issue is still present in all versions after the OP&apos;s reported versions. For creators trying to make a superflat void world for their Skyblock maps only regular mobs will spawn and Guardian Temples will not even spawn in.&lt;/p&gt;</comment>
                            <comment id="262070" author="smokey95dog" created="Thu, 5 Nov 2015 21:30:01 +0100"  >&lt;p&gt;Still an issue in 1.8.8 and the newest 1.9 snapshot 15w45a.&lt;/p&gt;</comment>
                            <comment id="226386" author="megasmurf" created="Mon, 4 May 2015 11:50:43 +0200"  >&lt;p&gt;Still an issue in 1.8.4&lt;/p&gt;</comment>
                            <comment id="219368" author="someone3x7" created="Thu, 19 Feb 2015 00:15:50 +0100"  >&lt;p&gt;Still an issue in 1.8.2-pre7&lt;/p&gt;</comment>
                            <comment id="205705" author="megatrain" created="Sun, 26 Oct 2014 00:29:30 +0200"  >&lt;p&gt;Seems similar in many ways to &lt;a href=&quot;https://bugs.mojang.com/browse/MC-59314&quot; title=&quot;Guardians not spawning on superflat worlds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-59314&quot;&gt;&lt;del&gt;MC-59314&lt;/del&gt;&lt;/a&gt; (Guardians not spawning on superflat worlds). &lt;/p&gt;

&lt;p&gt;Different details, also much easier to test (just create a superflat world using preset &quot;Water World&quot;).&lt;/p&gt;</comment>
                            <comment id="205178" author="megatrain" created="Sat, 25 Oct 2014 04:59:24 +0200"  >&lt;p&gt;Yes, confirmed that it is still a problem for 1.8.1 Prerelease 3&lt;/p&gt;

&lt;p&gt;Above directions still apply, use the following for superflat preset: &lt;br/&gt;
3;2*minecraft:bedrock,60*minecraft:dirt,minecraft:stone_slab;6;biome_1&lt;/p&gt;</comment>
                            <comment id="205050" author="galaxy_2alex" created="Fri, 24 Oct 2014 23:04:24 +0200"  >&lt;p&gt;Is this still a concern in the &lt;em&gt;current Minecraft version&lt;/em&gt; &lt;b&gt;1.8.1 Prerelease 3&lt;/b&gt; / Launcher version &lt;b&gt;1.5.3&lt;/b&gt; or later? If so, please &lt;em&gt;update the affected versions&lt;/em&gt; in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.&lt;/p&gt;</comment>
                            <comment id="154702" author="megatrain" created="Fri, 2 May 2014 03:49:34 +0200"  >&lt;p&gt;Can confirm, still a problem in release 1.7.9.&lt;/p&gt;

&lt;p&gt;I also was able to confirm that this is directly a result of the world generation settings. I generated a flatland using the settings in the description above, normal mobs spawned (see image generator_flat.png). &lt;/p&gt;

&lt;p&gt;I then used NBTExplorer and edited the &quot;generatorName&quot; value in level.dat from &quot;flat&quot; to &quot;default&quot;. After reloading the world, only witches spawned (see generator_default.png).&lt;/p&gt;</comment>
                            <comment id="133368" author="galaxy_2alex" created="Tue, 21 Jan 2014 23:40:37 +0100"  >&lt;p&gt;Is this still a concern in the &lt;em&gt;current Minecraft version&lt;/em&gt; &lt;b&gt;1.7.4&lt;/b&gt; / Launcher version &lt;b&gt;1.3.8&lt;/b&gt; or later? If so, please &lt;em&gt;update the affected versions&lt;/em&gt; in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.&lt;/p&gt;</comment>
                            <comment id="116512" author="megasmurf" created="Tue, 29 Oct 2013 13:22:56 +0100"  >&lt;p&gt;Still a bug in 1.7.2&lt;/p&gt;

&lt;p&gt;The strange part is that the &quot;area&quot; in Temple.dat under the data folder is generated and looks to be correct.&lt;br/&gt;
But the flatland code seems to ignore that data.&lt;/p&gt;</comment>
                            <comment id="54967" author="megasmurf" created="Mon, 18 Mar 2013 07:34:13 +0100"  >&lt;p&gt;Tested in 1.5 and the bug is still there!&lt;/p&gt;</comment>
                            <comment id="53663" author="bljat" created="Fri, 15 Mar 2013 20:13:15 +0100"  >&lt;p&gt;Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.&lt;/p&gt;</comment>
                            <comment id="26746" author="bljat" created="Thu, 6 Dec 2012 02:58:30 +0100"  >&lt;p&gt;Removed &quot;CLONE&quot; in the title.&lt;/p&gt;</comment>
                            <comment id="23764" author="chalmes" created="Wed, 21 Nov 2012 00:11:04 +0100"  >&lt;p&gt;You&apos;ve convinced me, confirmed  &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;

&lt;p&gt;Poking in the code it seems that yes there is a witch spawned by the world generator by default when the hut is initially created, but after that, only the regular mobs would spawn in there.  I tried deconstructing the hut and rebuilding the floor at different heights, but nothing would force another witch to spawn there.&lt;/p&gt;</comment>
                            <comment id="23576" author="megasmurf" created="Tue, 20 Nov 2012 09:19:25 +0100"  >&lt;p&gt;The witch pressent in the pic &quot;Can&apos;t reproduce in 1.4.5.jpg&quot; is generated with the hut and not spawned in in the hut.&lt;/p&gt;

&lt;p&gt;In the screenshot i posted a skeleton has spawned in the hut, and that only happens in flat worlds.&lt;br/&gt;
In normal worlds the only mob that can spawn in a hut is the witch!&lt;/p&gt;


&lt;p&gt;So i still claim this to be a bug.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="86530">MC-59314</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="233882">MC-147360</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="283961">MC-169728</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="284572">MC-169938</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="457911">MC-233201</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="459707">MC-233813</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="12923">MC-1582</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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                <attachments>
                            <attachment id="13873" name="2012-11-20_08.36.19.png" size="127225" author="megasmurf" created="Tue, 20 Nov 2012 09:14:14 +0100"/>
                            <attachment id="62491" name="generator_default.png" size="207475" author="megatrain" created="Fri, 2 May 2014 03:49:34 +0200"/>
                            <attachment id="62492" name="generator_flat.png" size="212304" author="megatrain" created="Fri, 2 May 2014 03:49:34 +0200"/>
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