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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-11601] Packet 26 (EXP orb entity spawn) send/receive disparity</title>
                <link>https://bugs.mojang.com/browse/MC-11601</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;Packet 26, EXP orb spawn, sends the position of the exp orb multiplied by 32. However, the client receives it and does not divide the position by 32, meaning the server must send an entity teleport packet to the client to correct the exp orb&apos;s position.&lt;/p&gt;

&lt;p&gt;I suggest each of these packet classes have getters to ensure that the correct position is being used, rather than keeping the &apos;encoding&apos; of the position inside the packet class then having the &apos;decoding&apos; inexplicably take place elsewhere.&lt;/p&gt;

&lt;p&gt;This was found when attempting to debug a related issue, that when joining another person&apos;s server I was unable to target certain mobs and minecarts until they moved into another chunk (that is: I believe the issue to be with a modification they have made to their server software, but despite this I do not think the client should react in such a way).&lt;/p&gt;</description>
                <environment></environment>
        <key id="25761">MC-11601</key>
            <summary>Packet 26 (EXP orb entity spawn) send/receive disparity</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="score_under">score</reporter>
                        <labels>
                            <label>entity</label>
                            <label>experience</label>
                            <label>packets</label>
                    </labels>
                <created>Tue, 12 Mar 2013 10:17:15 +0100</created>
                <updated>Sun, 14 Feb 2016 11:21:22 +0100</updated>
                            <resolved>Sun, 14 Feb 2016 01:02:24 +0100</resolved>
                                    <version>Minecraft 1.4.7</version>
                    <version>Minecraft 1.5</version>
                    <version>Minecraft 1.5.1</version>
                    <version>Minecraft 1.5.2</version>
                    <version>Minecraft 1.6.2</version>
                    <version>Minecraft 13w38a</version>
                    <version>Minecraft 13w38b</version>
                    <version>Minecraft 13w38c</version>
                    <version>Minecraft 1.8</version>
                                                                        <votes>10</votes>
                                    <watches>6</watches>
                                                                            <comments>
                            <comment id="285005" author="williewillus" created="Sat, 13 Feb 2016 01:54:17 +0100"  >&lt;p&gt;This was fixed a long time ago...&lt;/p&gt;

&lt;p&gt; yup &lt;a href=&quot;https://bugs.mojang.com/browse/MC-12013&quot; title=&quot;Experience Orbs invisible for one second right after spawning&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-12013&quot;&gt;&lt;del&gt;MC-12013&lt;/del&gt;&lt;/a&gt; (caused directly by this issue) was fixed in 1.8.1&lt;/p&gt;</comment>
                            <comment id="284866" author="marcono1234" created="Fri, 12 Feb 2016 16:51:25 +0100"  >&lt;p&gt;Can very likely not confirm for 16w06a&lt;/p&gt;

&lt;p&gt;In 16w06a the &lt;tt&gt;net.minecraft.client.network.NetHandlerPlayClient&lt;/tt&gt; is &lt;tt&gt;bkq.class&lt;/tt&gt; and &lt;tt&gt;net.minecraft.network.play.server.S11PacketSpawnExperienceOrb&lt;/tt&gt; is  &lt;tt&gt;fk.class&lt;/tt&gt;. While there is still no conversion back, it looks as if the coordinates are also not multiplied with 32.0D anymore.&lt;/p&gt;</comment>
                            <comment id="284650" author="emoluvjd2" created="Thu, 11 Feb 2016 21:37:06 +0100"  >&lt;p&gt;Does this affect the most recent snapshot?&lt;/p&gt;</comment>
                            <comment id="196379" author="williewillus" created="Tue, 2 Sep 2014 15:24:12 +0200"  >&lt;p&gt;Affects all versions up to and including release 1.8&lt;/p&gt;</comment>
                            <comment id="159946" author="jar_" created="Sun, 25 May 2014 09:37:48 +0200"  >&lt;p&gt;Is this still a concern in the &lt;em&gt;current Minecraft version&lt;/em&gt; &lt;b&gt;14w21b&lt;/b&gt; / Launcher version &lt;b&gt;1.4.4&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="148755" author="jar_" created="Mon, 24 Mar 2014 00:25:50 +0100"  >&lt;p&gt;Is this still a concern in the &lt;em&gt;current Minecraft version&lt;/em&gt; &lt;b&gt;14w11b / Launcher version *1.3.11&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="121485" author="talven81" created="Tue, 26 Nov 2013 22:16:12 +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="105614" author="williewillus" created="Mon, 23 Sep 2013 02:45:27 +0200"  >&lt;p&gt;Still affects all current versions (13w38c and beyond)&lt;br/&gt;
Direct cause of &lt;a href=&quot;https://bugs.mojang.com/browse/MC-12013&quot; title=&quot;Experience Orbs invisible for one second right after spawning&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-12013&quot;&gt;&lt;del&gt;MC-12013&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="52030" author="score_under" created="Tue, 12 Mar 2013 15:23:17 +0100"  >&lt;p&gt;As far as I&apos;m aware &lt;a href=&quot;https://bugs.mojang.com/browse/MC-460&quot; title=&quot;Experience orb position client-server desync&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-460&quot;&gt;&lt;del&gt;MC-460&lt;/del&gt;&lt;/a&gt; would be a granularity issue - Not only are imprecise positions are exchanged between the server and client, but since the exp orb accelerates with a value relative to the difference between a fixed distance and the nearest player&apos;s distance, any lag (e.g. the player spending longer close to the orb clientside than serverside) would quickly desynchronise the positions of the orb between the client and server.&lt;/p&gt;

&lt;p&gt;It is frankly dumb luck that XP orbs (usually) aren&apos;t invisible for the first second after spawning: the only reason the position is corrected clientside so fast is because there&apos;s a special exception given in the entity tracker stating that all entities which have only just changed velocity should be updated to all clients as fast as possible.&lt;/p&gt;</comment>
                            <comment id="52019" author="banana478" created="Tue, 12 Mar 2013 15:01:38 +0100"  >&lt;p&gt;Cause of &lt;a href=&quot;https://bugs.mojang.com/browse/MC-460&quot; title=&quot;Experience orb position client-server desync&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-460&quot;&gt;&lt;del&gt;MC-460&lt;/del&gt;&lt;/a&gt;?&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="26740">MC-12013</issuekey>
        </issuelink>
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                                                        </issuelinktype>
                            <issuelinktype id="10103">
                    <name>Relates</name>
                                                                <inwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="119894">MC-87565</issuekey>
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