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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-7809] Aiming at the very bottom of a side of an upper slab/stair places slabs/stairs right-side up in multiplayer</title>
                <link>https://bugs.mojang.com/browse/MC-7809</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;Just place a slab of any kind on the upper side of a block many times, and you&apos;ll sometime get one that converts to being on the bottom side of a block.&lt;/p&gt;
&lt;hr /&gt;
&lt;p&gt;&lt;sub&gt;Description from &lt;a href=&quot;https://bugs.mojang.com/browse/MC-89850&quot; title=&quot;Server and client disagree about correct alignment of placed blocks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-89850&quot;&gt;&lt;del&gt;MC-89850&lt;/del&gt;&lt;/a&gt;&lt;/sub&gt;&lt;/p&gt;

&lt;p&gt;When placing top- or bottom aligned blocks like slabs and stairs server and client disagree about the alignment of placed blocks&lt;/p&gt;

&lt;p&gt;Doesn&apos;t happen in single player (or isn&apos;t visible), but on dedicated server or Realms.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Steps to reproduce&lt;/b&gt;:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Place a block with a well defined center (e.g. stone bricks) at ca. eye level&lt;/li&gt;
	&lt;li&gt;Take a stair or slab&lt;/li&gt;
	&lt;li&gt;Aim slightly above the center of the block&lt;/li&gt;
	&lt;li&gt;Place block&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&lt;b&gt;The results&lt;/b&gt;:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;b&gt;Client&lt;/b&gt; places the block at the &lt;b&gt;correct&lt;/b&gt; top alignment&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;Server&lt;/b&gt; overwrites the block a &lt;em&gt;split second&lt;/em&gt; later at &lt;b&gt;incorrect&lt;/b&gt; bottom alignment&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Screenshots show before and after placement (the in-between position is quite difficult to capture)&lt;/p&gt;

&lt;hr /&gt;

&lt;p&gt;Code analysis by &lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=Panda4994&quot; class=&quot;user-hover&quot; rel=&quot;panda4994&quot;&gt;Panda4994&lt;/a&gt; in &lt;a href=&quot;https://bugs.mojang.com/browse/MC-7809?focusedCommentId=325436&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-325436&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this comment&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="20621">MC-7809</key>
            <summary>Aiming at the very bottom of a side of an upper slab/stair places slabs/stairs right-side up in multiplayer</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="grum">[Mojang] Grum (Erik Broes)</assignee>
                                    <reporter username="halgdp">Halgdp Halgdp</reporter>
                        <labels>
                            <label>block</label>
                    </labels>
                <created>Fri, 18 Jan 2013 16:39:35 +0100</created>
                <updated>Sat, 5 Nov 2016 17:03:37 +0100</updated>
                            <resolved>Fri, 30 Sep 2016 14:56:03 +0200</resolved>
                                    <version>Minecraft 1.4.7</version>
                    <version>Snapshot 13w03a</version>
                    <version>Minecraft 1.5</version>
                    <version>Snapshot 13w11a</version>
                    <version>Minecraft 1.5.1</version>
                    <version>Minecraft 1.6.4</version>
                    <version>Minecraft 13w42b</version>
                    <version>Minecraft 13w43a</version>
                    <version>Minecraft 1.7.1</version>
                    <version>Minecraft 1.7.2</version>
                    <version>Minecraft 1.8.1</version>
                    <version>Minecraft 1.8.3</version>
                    <version>Minecraft 1.8.4</version>
                    <version>Minecraft 1.8.5</version>
                    <version>Minecraft 1.8.6</version>
                    <version>Minecraft 1.8.7</version>
                    <version>Minecraft 1.8.8</version>
                    <version>Minecraft 15w44b</version>
                    <version>Minecraft 1.8.9</version>
                    <version>Minecraft 1.9.2</version>
                    <version>Minecraft 1.9.4</version>
                    <version>Minecraft 16w20a</version>
                    <version>Minecraft 1.10.2</version>
                                    <fixVersion>Minecraft 1.8</fixVersion>
                    <fixVersion>Minecraft 16w39c</fixVersion>
                                                        <votes>36</votes>
                                    <watches>17</watches>
                                                                            <comments>
                            <comment id="340524" author="pokechu22" created="Sat, 5 Nov 2016 17:03:37 +0100"  >&lt;p&gt;@&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=TheRedstoneRazor&quot; class=&quot;user-hover&quot; rel=&quot;TheRedstoneRazor&quot;&gt;TheRedstoneRazor&lt;/a&gt; &lt;a href=&quot;https://bugs.mojang.com/browse/MC-8&quot; title=&quot;Slabs and Stairs Placed Wrong&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-8&quot;&gt;&lt;del&gt;MC-8&lt;/del&gt;&lt;/a&gt; can be a duplicate of this report because this one was created with more details, details that allowed the devs to actually fix the issue.  Just because &lt;a href=&quot;https://bugs.mojang.com/browse/MC-8&quot; title=&quot;Slabs and Stairs Placed Wrong&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-8&quot;&gt;&lt;del&gt;MC-8&lt;/del&gt;&lt;/a&gt; was created first doesn&apos;t mean it&apos;s the best dupe-target for similar issues.&lt;/p&gt;

&lt;p&gt;In &lt;em&gt;some&lt;/em&gt; cases the content from the newer report will be moved to the older report if the fact that there is an older issue that is the same thing is found, but (especially if there are a lot of linked issues on the newer one and the older one is basically abandoned for 3 years) it won&apos;t usually be changed.  It doesn&apos;t matter, anyways - the issue number is insignificant for most purposes.  If having the smallest issue ID mattered, then one could just constantly replace old dupes with other unrelated issues - not necessary and generally a waste of time.&lt;/p&gt;</comment>
                            <comment id="340503" author="mustek" created="Sat, 5 Nov 2016 15:02:25 +0100"  >&lt;p&gt;It is not, this contains more details.&lt;/p&gt;</comment>
                            <comment id="340500" author="theredstonerazor" created="Sat, 5 Nov 2016 14:52:30 +0100"  >&lt;p&gt;Wrongly marked. This is a duplicate of &lt;a href=&quot;https://bugs.mojang.com/browse/MC-8&quot; title=&quot;Slabs and Stairs Placed Wrong&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-8&quot;&gt;&lt;del&gt;MC-8&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="325436" author="panda4994" created="Mon, 15 Aug 2016 05:43:51 +0200"  >&lt;p&gt;I came across this issue when looking into &lt;a href=&quot;https://bugs.mojang.com/browse/MC-4&quot; title=&quot;Item drops sometimes appear at the wrong location&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-4&quot;&gt;MC-4&lt;/a&gt; and found that it basically has the same cause.&lt;/p&gt;

&lt;p&gt;When you place a block the packet &lt;tt&gt;CPacketPlayerTryUseItemOnBlock&lt;/tt&gt; is sent to the server. It encodes the facing into bytes to transmit them which causes this inaccuracy.&lt;br/&gt;
The packet is just send when the player right clicks on a block holding an item, so it probably isn&apos;t an issue to just change the transmission of these values to floats.&lt;/p&gt;

&lt;p&gt;It would probably be good to add this to the description &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="322821" author="kumasasa" created="Sun, 31 Jul 2016 20:21:30 +0200"  >&lt;p&gt;This happens &lt;b&gt;only&lt;/b&gt; in Multiplayer but is &lt;b&gt;not&lt;/b&gt; lag dependant.&lt;/p&gt;</comment>
                            <comment id="322795" author="farogaming" created="Sun, 31 Jul 2016 18:31:55 +0200"  >&lt;p&gt;Can anyone confirm that this happens &lt;b&gt;only&lt;/b&gt; in multiplayer and/or that this is &lt;b&gt;always&lt;/b&gt; lag/latency related? If not, could then please someone provide a teleport command including rotation to reproduce this?&lt;br/&gt;
I&apos;ve seen this often in videos, I think it might have always been on servers, but I&apos;m not sure. I think it never happened to me, but I&apos;m also not sure of that.&lt;/p&gt;</comment>
                            <comment id="317969" author="tomatitus" created="Tue, 28 Jun 2016 07:16:04 +0200"  >&lt;p&gt;The easiest way to replicate this is by placing a top slab, then place the cursor as low on the side of the slab as possible. Finally, place a new slab and quickly move the cursor downwards.&lt;br/&gt;
BTW: confirmed for 1.10.1 and 1.10.2&lt;/p&gt;</comment>
                            <comment id="306037" author="fdagpigj" created="Fri, 20 May 2016 10:53:21 +0200"  >&lt;p&gt;Confirmed for 16w20a&lt;/p&gt;</comment>
                            <comment id="304034" author="den28rus" created="Wed, 11 May 2016 14:29:11 +0200"  >&lt;p&gt;Confirmed for 1.9.4&lt;/p&gt;</comment>
                            <comment id="303620" author="supernikio2" created="Sun, 8 May 2016 21:54:53 +0200"  >&lt;p&gt;Not fixed in 1.9.2&lt;/p&gt;</comment>
                            <comment id="281289" author="pancakeman77" created="Fri, 29 Jan 2016 23:12:03 +0100"  >&lt;p&gt;1.8.9 too&lt;/p&gt;</comment>
                            <comment id="261662" author="kumasasa" created="Wed, 4 Nov 2015 21:29:53 +0100"  >&lt;p&gt;Confirmed for 15w44b: &lt;a href=&quot;https://bugs.mojang.com/browse/MC-89850&quot; title=&quot;Server and client disagree about correct alignment of placed blocks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-89850&quot;&gt;&lt;del&gt;MC-89850&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="228787" author="boxfigs" created="Thu, 28 May 2015 21:32:31 +0200"  >&lt;p&gt;Still present in 1.8.5 and 1.8.6.&lt;/p&gt;</comment>
                            <comment id="225491" author="boxfigs" created="Thu, 23 Apr 2015 01:11:51 +0200"  >&lt;p&gt;Nope, not fixed at all.&lt;/p&gt;

&lt;p&gt;This happened when I was playing on my new server two months ago. Both server and client were running vanilla 1.8.3. I was recording at the time, so I have video proof.&lt;/p&gt;

&lt;p&gt;I haven&apos;t tested it in 1.8.4, but more likely than not it hasn&apos;t been fixed.&lt;/p&gt;

&lt;p&gt;EDIT: I tested it on my server just now, and the bug is still there! Please reopen and add 1.8.3/1.8.4 to the affected versions.&lt;/p&gt;

&lt;p&gt;EDIT again: The affected versions have been updated, but this wasn&apos;t reopened.&lt;/p&gt;</comment>
                            <comment id="215106" author="ezekielelin" created="Tue, 6 Jan 2015 20:39:04 +0100"  >&lt;p&gt;Resolved as fixed in 1.8.1&lt;/p&gt;</comment>
                            <comment id="206517" author="knightminer" created="Thu, 30 Oct 2014 03:42:48 +0100"  >&lt;p&gt;Fixed in 1.8 or before&lt;/p&gt;</comment>
                            <comment id="205230" author="galaxy_2alex" created="Sat, 25 Oct 2014 11:30:56 +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="185933" author="davwheat" created="Thu, 7 Aug 2014 22:19:31 +0200"  >&lt;p&gt;This happens when you place a slab on the bottom row of pixels on a upside down slab&lt;/p&gt;</comment>
                            <comment id="148559" author="achimnol" created="Sat, 22 Mar 2014 19:16:01 +0100"  >&lt;p&gt;I&apos;m experiencing the same problem with 1.7.5 multi-player. It&apos;s annoying for building with slabs.&lt;br/&gt;
Nonetheless, this does not seem to happen with single-player modes (confirmed in 1.7.5 and 14w11b).&lt;br/&gt;
I have no idea on what could cause this bug. Just a guess, would be this related to kind of floating-point round-off errors or server-client synchronization issues?&lt;/p&gt;</comment>
                            <comment id="132667" author="computer_king" created="Sat, 18 Jan 2014 20:52:57 +0100"  >&lt;p&gt;Extremely annoying.  This really shouldn&apos;t be able to happen because there is no way of selecting the bottom half of the block if you are placing it against another slab.  Please fix it.&lt;/p&gt;</comment>
                            <comment id="119702" author="djfe" created="Sat, 16 Nov 2013 14:17:40 +0100"  >&lt;p&gt;bug is still in the game please release a fix &lt;img class=&quot;emoticon&quot; src=&quot;https://bugs.mojang.com/images/icons/emoticons/wink.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="85927" author="phycist1616" created="Mon, 8 Jul 2013 11:39:15 +0200"  >&lt;p&gt;Agh, this is so annoying for the non-host when bridging with half-slabs in LAN play.&lt;/p&gt;

&lt;p&gt;edit:  Version 1.6.2 pre-release.&lt;/p&gt;</comment>
                            <comment id="44172" author="itsmartin" created="Thu, 7 Feb 2013 12:53:40 +0100"  >&lt;p&gt;&lt;a href=&quot;http://www.reddit.com/r/Minecraft/comments/1813ei/bridging_with_topslabs_in_smp/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Discussion of this bug on /r/minecraft&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://i.imgur.com/P5vhAOI.gif&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SethBling&apos;s gif showing the bug&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="38412" author="bljat" created="Sun, 20 Jan 2013 00:45:09 +0100"  >&lt;p&gt;Confirmed in 13w03a on multiplayer. Aiming at the very bottom of an upper slab like in the screenshot places the upcoming slab as lower slab.&lt;br/&gt;
Edit: Works fine in singleplayer.&lt;/p&gt;</comment>
                            <comment id="38332" author="halgdp" created="Sat, 19 Jan 2013 19:12:02 +0100"  >&lt;p&gt;Yes, it has happened when I placed it aside another half-slab that was placed correctly.&lt;br/&gt;
It happened to myself and it keep happening to pretty much every youtuber I&apos;m watching.&lt;/p&gt;</comment>
                            <comment id="38044" author="candoran2" created="Fri, 18 Jan 2013 23:02:01 +0100"  >&lt;p&gt;And you&apos;re absolutely sure the point of the block you were pointing at didn&apos;t change slightly while you were moving so you pointed at the lower half of the block?&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="22839">MC-9269</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="59087">MC-36953</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="70003">MC-44810</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="76405">MC-50554</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="111717">MC-81379</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="123100">MC-89850</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="132696">MC-96283</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="135027">MC-97569</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="140470">MC-101712</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="141975">MC-102884</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="145511">MC-104739</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="11246">MC-8</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10103">
                    <name>Relates</name>
                                            <outwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="123325">MC-90022</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="19196" name="2013-01-20_00.38.51.png" size="58899" author="bljat" created="Sun, 20 Jan 2013 00:46:45 +0100"/>
                            <attachment id="122453" name="2015-10-05_00.57.38.png" size="321433" author="kumasasa" created="Sun, 31 Jul 2016 20:20:53 +0200"/>
                            <attachment id="122454" name="2015-10-05_00.57.51.png" size="219693" author="kumasasa" created="Sun, 31 Jul 2016 20:20:53 +0200"/>
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