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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>
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<item>
            <title>[MC-342] Positions of entities become offset to clients in SMP</title>
                <link>https://bugs.mojang.com/browse/MC-342</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;http://www.minecraftforum.net/topic/1527204-adv12w42bindevthe-forbidden-dungeon-of-ashndar-open-world-by-arkantos-war/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;an adventure map&lt;/a&gt; in SMP, I was experiencing strange issues where the locations of other players seemed to be offset. This would occur mainly in cramped places (on the map in question, in the dungeon at the top of the mountain).&lt;/p&gt;

&lt;p&gt;I would notice players passing through walls, and sometimes floating or &quot;swimming&quot; in the ground. At some times, the offset seemed to be so bad that players would be rendered several blocks away from their true locations.&lt;/p&gt;

&lt;p&gt;Logging out and back in would sometimes correct this issue, but it would frequently return.&lt;/p&gt;

&lt;p&gt;I noticed this issue with:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Players who were far away and made a long journey&lt;/li&gt;
	&lt;li&gt;Players who were teleported to me&lt;/li&gt;
	&lt;li&gt;Players who I was with during a long journey (namely, up the mountain in the map)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I was running the server on my own computer, and I was connected via localhost. The other players were connected from various places in different states. As my computer is not very good, I noticed a few &quot;&amp;lt;Playername&amp;gt; moved wrongly!&quot; messages in the console. This may be related, but I did not notice any direct connection between the messages and the phenomenon.&lt;/p&gt;

&lt;p&gt;This issue has occurred before, on the 1.4.0 prerelease, as well, and is not an isolated incident.&lt;/p&gt;

&lt;p&gt;EDIT: I should also note that this never happens to me on Bukkit servers, whether or not I am the host. A server host I spoke with said he has noticed this extensively and exclusively on vanilla servers when he hosts them.&lt;/p&gt;


&lt;p&gt;Video footage can be seen in &lt;a href=&quot;http://www.twitch.tv/sethbling/b/355261121&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this Sethbling livestream&lt;/a&gt;, starting after a series of teleports at 1:38:10. Note that frequent complaints of players in the wrong position (or &quot;invisible&quot;) have occurred throughout the video. This server is vanilla 1.4.6 (or possibly 1.4.7, but the two are interchangeable as only one class differs between the two). Sethbling may or may not be the server host; I&apos;m sure Marc Watson of Mojang can clarify (he was present).&lt;/p&gt;

&lt;p&gt;EDIT: Since then, I have realized this effect can be reproduced reliably on minecart entities. Steps to reproduce:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Run your own server&lt;/li&gt;
	&lt;li&gt;Set up a minecart rail loop with powered rails and a two block drop&lt;/li&gt;
	&lt;li&gt;Add a minecart, and make sure it goes around the loop&lt;/li&gt;
	&lt;li&gt;Observe that, after some time (this seems random), the minecart gets misaligned: although it tracks the same path, it may appear floating or offset by several blocks.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;In my experience, lag on my system makes this effect more likely, as does moving around.&lt;/p&gt;</description>
                <environment>Windows 7 64-bit, 4GB RAM</environment>
        <key id="11605">MC-342</key>
            <summary>Positions of entities become offset to clients in SMP</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="10001">Awaiting Response</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="wolfiemario">WolfieMario</reporter>
                        <labels>
                            <label>multiplayer</label>
                            <label>rendering</label>
                    </labels>
                <created>Thu, 25 Oct 2012 06:08:17 +0200</created>
                <updated>Fri, 19 Feb 2021 09:21:47 +0100</updated>
                            <resolved>Tue, 23 Apr 2019 07:57:49 +0200</resolved>
                                    <version>Minecraft 1.4.2</version>
                    <version>Minecraft 1.4.6</version>
                    <version>Minecraft 1.4.7</version>
                    <version>Snapshot 13w04a</version>
                    <version>Snapshot 13w10b</version>
                    <version>Minecraft 1.5</version>
                    <version>Minecraft 1.5.2</version>
                    <version>Snapshot 13w23b</version>
                    <version>Minecraft 1.6.1</version>
                    <version>Minecraft 1.6.2</version>
                    <version>Minecraft 1.6.4</version>
                    <version>Minecraft 1.7.4</version>
                    <version>Minecraft 1.8.9</version>
                    <version>Minecraft 15w51b</version>
                    <version>Minecraft 16w06a</version>
                    <version>Minecraft 1.10.2</version>
                    <version>Minecraft 17w06a</version>
                    <version>Minecraft 1.13.2</version>
                                                                        <votes>23</votes>
                                    <watches>16</watches>
                                                                            <comments>
                            <comment id="916870" author="arisabot" created="Tue, 9 Feb 2021 09:14:04 +0100"  >&lt;p&gt;This report is currently missing crucial information. Please take a look at the other comments to find out what we are looking for.&lt;br/&gt;
If you added the required information and a moderator sees your comment, they will reopen and update the report. However, if you think your update to this report has been overlooked or you want to make sure that this report is reopened, you can contact the Mojira staff on &lt;a href=&quot;https://discordapp.com/invite/rpCyfKV&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Discord&lt;/a&gt; or &lt;a href=&quot;https://www.reddit.com/r/Mojira/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Reddit&lt;/a&gt;.&lt;br/&gt;
&lt;sub&gt;&lt;font color=&quot;#888&quot;&gt;&amp;#8211; I am a bot. This action was performed automatically! Please report any issues on &lt;a href=&quot;https://discordapp.com/invite/rpCyfKV&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Discord&lt;/a&gt; or &lt;a href=&quot;https://www.reddit.com/r/Mojira/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Reddit&lt;/a&gt;&lt;/font&gt;&lt;/sub&gt;&lt;/p&gt;</comment>
                            <comment id="893576" author="arisabot" created="Mon, 11 Jan 2021 12:33:51 +0100"  >&lt;p&gt;This report is currently missing crucial information. Please take a look at the other comments to find out what we are looking for.&lt;br/&gt;
If you added the required information and a moderator sees your comment, they will reopen and update the report. However, if you think your update to this report has been overlooked or you want to make sure that this report is reopened, you can contact the Mojira staff on &lt;a href=&quot;https://discordapp.com/invite/rpCyfKV&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Discord&lt;/a&gt; or &lt;a href=&quot;https://www.reddit.com/r/Mojira/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Reddit&lt;/a&gt;.&lt;br/&gt;
&lt;sub&gt;&lt;font color=&quot;#888&quot;&gt;&amp;#8211; I am a bot. This action was performed automatically! Please report any issues on &lt;a href=&quot;https://discordapp.com/invite/rpCyfKV&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Discord&lt;/a&gt; or &lt;a href=&quot;https://www.reddit.com/r/Mojira/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Reddit&lt;/a&gt;&lt;/font&gt;&lt;/sub&gt;&lt;/p&gt;</comment>
                            <comment id="538066" author="pokechu22" created="Tue, 23 Apr 2019 18:30:59 +0200"  >&lt;p&gt; It also happened in Etho&apos;s LP, some time in &lt;a href=&quot;https://www.youtube.com/watch?v=LrgLaL-M3uI&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;episode 518&lt;/a&gt;... but I don&apos;t recall exactly when.  It&apos;s worth noting that that&apos;s a singleplayer vanilla world, and again it&apos;s a minecart.  But it doesn&apos;t help too much with reproducing :/&lt;/p&gt;</comment>
                            <comment id="537912" author="galaxy_2alex" created="Tue, 23 Apr 2019 07:57:50 +0200"  >&lt;p&gt;I&apos;ve tried to reproduce the issue by having a setup where a villager in a cart goes to chunks that are constantly loaded and unloaded, but I am unable reproduce the issue. Does anyone have a reliable way of reproducing this issue? If not, I will close this within a few weeks.&lt;/p&gt;

&lt;p&gt;The video provided doesn&apos;t really tell us much about the server itself, it is possible the server had modificiations installed.&lt;/p&gt;</comment>
                            <comment id="519917" author="pokechu22" created="Mon, 18 Feb 2019 00:57:00 +0100"  >&lt;p&gt;Shown to still exist in &lt;a href=&quot;https://youtu.be/aoLvfwB6Kdk?t=4536&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this video&lt;/a&gt; (at 1:15:36), which I&apos;d say is sufficient evidence that this still exists (even though they&apos;re using optifine) when combined with the lack of any protocol changes regarding entity motion.  It&apos;s not exactly the same setup as in the description, but it is a card going some distance and then getting desync&apos;d.&lt;/p&gt;</comment>
                            <comment id="444984" author="farogaming" created="Thu, 5 Apr 2018 21:17:44 +0200"  >&lt;p&gt;Does the way to reproduce in the description still work?&lt;/p&gt;</comment>
                            <comment id="348150" author="pokechu22" created="Sat, 10 Dec 2016 18:03:06 +0100"  >&lt;p&gt;I haven&apos;t reproduced it, but relative movement still is used, so it can &lt;em&gt;hypothetically&lt;/em&gt; happen.  I haven&apos;t seen it actually happen though, so if anyone has seen it, that would be useful information.&lt;/p&gt;</comment>
                            <comment id="348142" author="cdes5" created="Sat, 10 Dec 2016 17:27:12 +0100"  >&lt;p&gt;Is this still a problem in Minecraft 1.11?&lt;/p&gt;</comment>
                            <comment id="323486" author="pokechu22" created="Sat, 6 Aug 2016 19:27:52 +0200"  >&lt;p&gt;I personally haven&apos;t  reproduced this in 1.10.2 but I did ask other players on a server I play on and they had.  So it still seems to be present.&lt;/p&gt;</comment>
                            <comment id="323261" author="JIRAUSER71590" created="Thu, 4 Aug 2016 13:07:29 +0200"  >&lt;p&gt;Is this still an issue in 1.10.2?&lt;/p&gt;</comment>
                            <comment id="284819" author="nothing999" created="Fri, 12 Feb 2016 14:05:07 +0100"  >&lt;p&gt;16W06A Player falls onto active redstone then sinks into block. Thus far cannot reproduce purposely altho occurred several times. Possibly related to early Elytra flight.&lt;/p&gt;</comment>
                            <comment id="273211" author="roiex" created="Fri, 18 Dec 2015 22:23:43 +0100"  >&lt;p&gt;Can experience this with Minecarts after a while in 15w51b&lt;/p&gt;</comment>
                            <comment id="204829" author="galaxy_2alex" created="Thu, 23 Oct 2014 21:54:02 +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="148490" author="ezekielelin" created="Sat, 22 Mar 2014 13:31:26 +0100"  >&lt;p&gt;Is this still a concern in the latest Minecraft version &lt;b&gt;14w11b&lt;/b&gt;? 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="121816" author="stuffjunk" created="Wed, 27 Nov 2013 19:21:25 +0100"  >&lt;p&gt;I have also seen the player bug on that same 1.6.4 server&lt;/p&gt;</comment>
                            <comment id="121814" author="stuffjunk" created="Wed, 27 Nov 2013 19:15:35 +0100"  >&lt;p&gt;i&apos;m pretty sure i have seen the minecart bug on a 1.6.4 server.&lt;/p&gt;</comment>
                            <comment id="98512" author="taurose" created="Mon, 12 Aug 2013 13:57:29 +0200"  >&lt;p&gt;I recently made a bugfix mod for glitching mobs and I think this should be covered as well: &lt;a href=&quot;https://github.com/taurose/Unglitch&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/taurose/Unglitch&lt;/a&gt; (4).&lt;/p&gt;

&lt;p&gt;In the tracker code there&apos;s a flag that determines whether an entity has moved far enough to send a position update. Several lines later, if the flag is true, the tracker stores the entity&apos;s location that is supposedly sent to the players for later updates. However, it seems that over time Mojang added several conditions to circumvent that flag and send or not send position updates regardless, which causes the &quot;last sent&quot; locations to be off. And once that happened, the clients receive false position updates and the entity appears offset.&lt;br/&gt;
Luckily, this can be fixed quite easily with a few lines once you know the problem. &lt;/p&gt;</comment>
                            <comment id="72866" author="starcksjoen" created="Tue, 11 Jun 2013 09:27:40 +0200"  >&lt;p&gt;Still in 13w23b&lt;/p&gt;</comment>
                            <comment id="66242" author="wolfiemario" created="Sun, 12 May 2013 01:43:45 +0200"  >&lt;p&gt;&lt;a href=&quot;http://youtu.be/9Sxm1HAeHms?t=7m43s&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;I found a video where the bug is extensively demonstrated and tested &lt;/a&gt;. Also, note at the end the client-side offset arrows. Considering this bug pertains to entity offset in SMP, it &lt;em&gt;may&lt;/em&gt; be related, but probably isn&apos;t. But all of the teleportation bugs are textbook demonstrations of this bug.&lt;/p&gt;</comment>
                            <comment id="58603" author="kulttuuri" created="Wed, 3 Apr 2013 10:44:35 +0200"  >&lt;p&gt;So far I&apos;ve mostly managed to notice this with the player&apos;s not appearing to others after doing teleports. Been there for ages, as far as from beta 1.8. Players mostly appear back when you drop down a block below. Disappearing part seems to have something to do with the entitytracker, in MCP it looked like that player was not in the server&apos;s entity tracker after doing a teleport and player positions where therefore not syncronized to other players (until the player dropped a block below and then was added back into the entity tracker).&lt;/p&gt;</comment>
                            <comment id="54954" author="wolfiemario" created="Mon, 18 Mar 2013 03:56:53 +0100"  >&lt;p&gt;I&apos;ve managed to get this now in 1.5 on minecarts, so it&apos;s not limited to players. Which is pretty bad, to be honest, but at least it makes it easier to test.&lt;/p&gt;</comment>
                            <comment id="36924" author="bljat" created="Tue, 15 Jan 2013 03:32:29 +0100"  >&lt;p&gt;Reopened.&lt;/p&gt;</comment>
                            <comment id="36922" author="wolfiemario" created="Tue, 15 Jan 2013 03:23:26 +0100"  >&lt;p&gt;Oh, sorry, I had forgotten about this, as it&apos;s been a while since I&apos;ve dealt with vanilla servers (I will note that I haven&apos;t experienced it in Bukkit whatsoever).&lt;/p&gt;

&lt;p&gt;However, I recently saw Sethbling livestreaming on a vanilla 1.4.6 server: &lt;a href=&quot;http://www.twitch.tv/sethbling/b/355261121&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.twitch.tv/sethbling/b/355261121&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;At 1:38:10, you can clearly observe that, after a series of teleports, players appear in the wrong positions for Sethbling (including the blaze-suit player sinking into the ground at 1:38:30, and the flying cactus-suit player just before that). Sethbling and other players were also complaining about &quot;invisible&quot; players, and frequent relogs were needed to correct the issue.&lt;/p&gt;

&lt;p&gt;So, can this be reopened?&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="21377">MC-8451</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="25406">MC-11289</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="32695">MC-16782</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="131958">MC-96000</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="11448">MC-197</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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