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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-1230] Players and mobs can fall through extending/retracting pistons</title>
                <link>https://bugs.mojang.com/browse/MC-1230</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;Player + retracting: &lt;a href=&quot;http://i.imgur.com/MeZHz.gif&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://i.imgur.com/MeZHz.gif&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Mob + extending: &lt;a href=&quot;http://i.imgur.com/2DarX.gif&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://i.imgur.com/2DarX.gif&lt;/a&gt;&lt;/p&gt;</description>
                <environment>Windows 7 64 bit, Java 7 (latest version)</environment>
        <key id="12546">MC-1230</key>
            <summary>Players and mobs can fall through extending/retracting pistons</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="xilix">Indigo</reporter>
                        <labels>
                            <label>mob</label>
                            <label>piston</label>
                            <label>player</label>
                    </labels>
                <created>Mon, 29 Oct 2012 21:58:41 +0100</created>
                <updated>Mon, 27 May 2024 23:56:00 +0200</updated>
                            <resolved>Tue, 15 Sep 2015 17:16:51 +0200</resolved>
                                    <version>Minecraft 1.4.2</version>
                    <version>Minecraft 1.4.7</version>
                    <version>Snapshot 13w05b</version>
                    <version>Minecraft 1.5</version>
                    <version>Snapshot 13w11a</version>
                    <version>Minecraft 1.5.1</version>
                    <version>Minecraft 1.7.2</version>
                    <version>Minecraft 1.7.4</version>
                    <version>Minecraft 14w02c</version>
                    <version>Minecraft 14w03b</version>
                    <version>Minecraft 14w04a</version>
                    <version>Minecraft 1.7.5</version>
                    <version>Minecraft 1.7.9</version>
                    <version>Minecraft 14w18b</version>
                    <version>Minecraft 14w21b</version>
                    <version>Minecraft 1.8</version>
                    <version>Minecraft 1.8.1-pre2</version>
                    <version>Minecraft 1.8.8</version>
                    <version>Minecraft 15w36d</version>
                    <version>Minecraft 15w37a</version>
                                    <fixVersion>Minecraft 15w38a</fixVersion>
                                                        <votes>5</votes>
                                    <watches>7</watches>
                                                                            <comments>
                            <comment id="333639" author="an_yminer" created="Thu, 6 Oct 2016 20:03:20 +0200"  >&lt;p&gt;I just found out that shifting floors work again. (Mobs fall through moving blocks; Players don&apos;t fall but have trouble moving)&lt;/p&gt;</comment>
                            <comment id="333595" author="an_yminer" created="Thu, 6 Oct 2016 18:21:07 +0200"  >&lt;p&gt;@&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=An_yMiner&quot; class=&quot;user-hover&quot; rel=&quot;An_yMiner&quot;&gt;An_yMiner&lt;/a&gt; fixed in Minecraft 16w40a&lt;/p&gt;</comment>
                            <comment id="297773" author="JIRAUSER71590" created="Thu, 31 Mar 2016 18:13:16 +0200"  >&lt;p&gt;when &lt;a href=&quot;https://bugs.mojang.com/browse/MC-89030&quot; title=&quot;Pistons warp entities too much (Pistons pull entities in/through blocks)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-89030&quot;&gt;&lt;del&gt;MC-89030&lt;/del&gt;&lt;/a&gt; is fixed, and this is still an issue, then this will be reopened, not sooner as it&apos;s very likely the same issue as you experience&lt;/p&gt;</comment>
                            <comment id="297770" author="an_yminer" created="Thu, 31 Mar 2016 18:02:45 +0200"  >&lt;p&gt;@sethbling&apos;s video: In order for a block to be able to be pushed the ones in front need to moved or destroyed. So when the piston extention gets pulled back, the piston base gets removed; Entities inside the extention are set infront of it. No surprise here.&lt;br/&gt;
&lt;a name=&quot;AnyMinerdescription&quot;&gt;&lt;/a&gt;&lt;br/&gt;
What I&apos;m complaining about is the behaviour of entities being moved into a position, where other blocks are:&lt;br/&gt;
Block started moving in tick t&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;&amp;nbsp;&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; t &amp;lt;= -3 &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; -3 &amp;lt; t &amp;lt; 0 &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; t = -0 &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; t = +0 &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; 0 &amp;lt; t &amp;lt; 3 &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; 3 &amp;lt;= t &lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Entity movement blocked &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; y &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; y &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; n &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; y &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; n &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; n &lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;

</comment>
                            <comment id="297751" author="JIRAUSER71590" created="Thu, 31 Mar 2016 15:34:06 +0200"  >&lt;p&gt;When retracting they do, see sethbling&apos;s video about it, this issue has been fixed, what you see &lt;b&gt;is&lt;/b&gt; &lt;a href=&quot;https://bugs.mojang.com/browse/MC-89030&quot; title=&quot;Pistons warp entities too much (Pistons pull entities in/through blocks)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-89030&quot;&gt;&lt;del&gt;MC-89030&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="297748" author="an_yminer" created="Thu, 31 Mar 2016 15:25:39 +0200"  >&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=jirauser71590&quot; class=&quot;user-hover&quot; rel=&quot;jirauser71590&quot;&gt;jirauser71590&lt;/a&gt; &lt;a href=&quot;https://bugs.mojang.com/browse/MC-89030&quot; title=&quot;Pistons warp entities too much (Pistons pull entities in/through blocks)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-89030&quot;&gt;&lt;del&gt;MC-89030&lt;/del&gt;&lt;/a&gt; moves entities out of blocks, not into them.&lt;/p&gt;</comment>
                            <comment id="297637" author="JIRAUSER71590" created="Wed, 30 Mar 2016 23:22:39 +0200"  >&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=an_yminer&quot; class=&quot;user-hover&quot; rel=&quot;An_yMiner&quot;&gt;an_yminer&lt;/a&gt; actually what you see there is &lt;a href=&quot;https://bugs.mojang.com/browse/MC-89030&quot; title=&quot;Pistons warp entities too much (Pistons pull entities in/through blocks)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-89030&quot;&gt;&lt;del&gt;MC-89030&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="297606" author="an_yminer" created="Wed, 30 Mar 2016 21:55:07 +0200"  >&lt;p&gt;still in 1.9.2&lt;br/&gt;
&lt;a href=&quot;https://youtu.be/LK6rZLBWRUg&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://youtu.be/LK6rZLBWRUg&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="294144" author="an_yminer" created="Thu, 10 Mar 2016 23:03:04 +0100"  >&lt;p&gt;It&apos;s still a problem for every block that moves before the mob takes notice. Mobs fall through retracting pistons; Mobs and players can be pushed into blocks that started moving earlier in the same tick.&lt;/p&gt;</comment>
                            <comment id="250053" author="grum" created="Wed, 16 Sep 2015 20:23:59 +0200"  >&lt;p&gt;Things will not get pushed up when they get stuck in a block. They will prefer to fall down.&lt;/p&gt;

&lt;p&gt;I think the current behaviour is at least predictable &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="249988" author="cubethethird" created="Wed, 16 Sep 2015 19:41:43 +0200"  >&lt;p&gt;I&apos;m not entirely convinced that the remaining issue is actually a bug. Previously, if an entity is standing on a block, and a piston pushes it, it falls through the piston to the block below it. Now, instead of falling all the way through, it falls onto the &quot;neck&quot; portion, which is solid. Upon retracting the block, the player/entity is inside it, since the block is taller than the &quot;neck&quot;, causing them to fall through. The same behaviour can be observed if the player stands on a slab, and is pushed by a full block.&lt;/p&gt;</comment>
                            <comment id="249955" author="JIRAUSER71590" created="Wed, 16 Sep 2015 17:40:23 +0200"  >&lt;p&gt;I can also confirm for both plyer and skeleton (at least)&lt;/p&gt;</comment>
                            <comment id="249940" author="cubethethird" created="Wed, 16 Sep 2015 17:07:43 +0200"  >&lt;p&gt;Can confirm for player, but not for mobs.&lt;/p&gt;</comment>
                            <comment id="249924" author="rumkugel13" created="Wed, 16 Sep 2015 16:48:42 +0200"  >&lt;p&gt;Still happening in 15w38a..&lt;/p&gt;</comment>
                            <comment id="249545" author="grum" created="Mon, 14 Sep 2015 09:57:13 +0200"  >&lt;p&gt;This will be marked fixed in a snapshot near you soon.&lt;/p&gt;</comment>
                            <comment id="248871" author="kingsupernova" created="Sat, 12 Sep 2015 12:04:40 +0200"  >&lt;p&gt;Confirmed in 15w37a. Should be mentioned that it happens with any blocks being pushed by a piston, not just the arm.&lt;/p&gt;</comment>
                            <comment id="212377" author="promethean" created="Sat, 20 Dec 2014 18:27:38 +0100"  >&lt;p&gt;This also affects slime blocks moving with the piston head, when the piston is extending down or horizontally or retracting in any direction. But since it doesn&apos;t affect solid blocks, I&apos;d say the problem isn&apos;t that we can fall through block 36, but that we can also fall through TileEntity&lt;/p&gt;
{id:&quot;Piston&quot;, blockId: minecraft:piston_head}
&lt;p&gt; and &lt;/p&gt;
{id:&quot;Piston&quot;, blockId: minecraft:slime}</comment>
                            <comment id="204147" author="domohead" created="Sat, 18 Oct 2014 18:22:47 +0200"  >&lt;p&gt;This is because you can fall through block 36&lt;/p&gt;</comment>
                            <comment id="204140" author="rydian" created="Sat, 18 Oct 2014 17:38:33 +0200"  >&lt;p&gt;Confirmed in 1.8.1-pre2.&lt;br/&gt;
&lt;a href=&quot;http://gfycat.com/TatteredDeliciousDegu&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://gfycat.com/TatteredDeliciousDegu&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="149438" author="zeuslightning125" created="Mon, 31 Mar 2014 07:17:57 +0200"  >&lt;p&gt;Confirmed 1.7.5 with my accidental duplicate &lt;a href=&quot;https://bugs.mojang.com/browse/MC-52281&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://bugs.mojang.com/browse/MC-52281&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="134086" author="fienxjox" created="Thu, 23 Jan 2014 19:17:08 +0100"  >&lt;p&gt;Continued confirmation, 14w04a&lt;/p&gt;</comment>
                            <comment id="116448" author="fienxjox" created="Tue, 29 Oct 2013 04:04:27 +0100"  >&lt;p&gt;Don&apos;t know about 1.6.4, but I can confirm 1.7.2 / launcher 1.2.8&lt;/p&gt;</comment>
                            <comment id="16043" author="xilix" created="Wed, 31 Oct 2012 21:32:10 +0100"  >&lt;p&gt;I tested your modification and it seems you only fixed mobs going through blocks. The main problem was having things fall through the wooden retracting/extending piston part.&lt;/p&gt;</comment>
                            <comment id="15616" author="dieval" created="Tue, 30 Oct 2012 22:54:50 +0100"  >&lt;p&gt;Yes, I don&apos;t work for Mojang. Mojangsta have &quot;&lt;span class=&quot;error&quot;&gt;&amp;#91;Mojang&amp;#93;&lt;/span&gt;&quot; in front of their name.&lt;/p&gt;

&lt;p&gt;I think it will be fixed eventually. It may take some time for mojang to see this bug though.&lt;/p&gt;</comment>
                            <comment id="15615" author="xilix" created="Tue, 30 Oct 2012 22:44:28 +0100"  >&lt;p&gt;@DiEvAl So you don&apos;t work for Mojang and just made a mod? Is this actually going to get fixed?&lt;/p&gt;</comment>
                            <comment id="15344" author="dieval" created="Tue, 30 Oct 2012 10:40:10 +0100"  >&lt;p&gt;Fixed. &lt;span class=&quot;error&quot;&gt;&amp;#91;www.minecraftforum.net/topic/1543986-dievals-bugfixes-for-mojira/&amp;#93;&lt;/span&gt;&lt;/p&gt;</comment>
                            <comment id="15246" author="dieval" created="Tue, 30 Oct 2012 00:42:02 +0100"  >&lt;p&gt;I think I fixed this bug. I&apos;ll post the fix today in the morning (it&apos;s 1:40 AM now)&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>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10101">
                    <name>Cloners</name>
                                                                <inwardlinks description="is cloned by">
                                        <issuelink>
            <issuekey id="256712">MC-159503</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10102">
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                                        <issuelink>
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            <issuekey id="78328">MC-52281</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="81729">MC-55310</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="82869">MC-56320</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="96102">MC-68512</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="101852">MC-73871</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="103768">MC-75574</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="106516">MC-77789</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="113479">MC-82548</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10103">
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                                                                <inwardlinks description="relates to">
                                        <issuelink>
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