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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>[MCPE-16314] Blocks are rarely deleted when pushed by a piston, and pushing something that was pulled. </title>
                <link>https://bugs.mojang.com/browse/MCPE-16314</link>
                <project id="10200" key="MCPE">Minecraft (Bedrock codebase)</project>
                    <description>&lt;p&gt;Edit: Fixed as of 0.15.3 or 0.15.4&lt;/p&gt;

&lt;p&gt;on occasion, when a block pushes a different block that is simultaneously pulled by a slime block, the block that pushed will cease to exist. Here is a diagram:&lt;br/&gt;
&amp;gt; = piston    s = slime&lt;br/&gt;
0 = block     x = vanishing block&lt;/p&gt;

&lt;p&gt;&amp;gt;x0&lt;br/&gt;
&amp;gt;0s&lt;/p&gt;

&lt;p&gt;Power the pistons simultaneously, and the x block might disappear&lt;/p&gt;

&lt;p&gt;This only happens at certain points in the world, and those points change at reload. A simple way to recreate this bug is to make the flying machine shown in the picture, and wait for it to break. The flying machine will bounce back and forth between the two bedrock until one of the observers disappear. If this fails to happen, reload the world, and try again. It shouldn&apos;t take too long&lt;/p&gt;

&lt;p&gt;This does not duplicate &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-14654&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;MCPE-14654&lt;/a&gt; as any block can disapear, not just a piston.&lt;/p&gt;

&lt;p&gt;This does not duplicate &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-15268&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;MCPE-15268&lt;/a&gt; as the blocks are permanatly gone, not just temporaraly.&lt;/p&gt;

&lt;p&gt;This may duplicate &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-14772&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;MCPE-14772&lt;/a&gt; but that is marked as a duplicite of &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-14522&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;MCPE-14522&lt;/a&gt; and I see no relation between this and &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-14522&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;MCPE-14522&lt;/a&gt;&lt;/p&gt;</description>
            <key id="146813">MCPE-16314</key>
            <summary>Blocks are rarely deleted when pushed by a piston, and pushing something that was pulled. </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>
                                            <reporter username="Lewmas Fain">Samuel Finch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 20 Jul 2016 23:35:08 +0200</created>
                <updated>Mon, 18 Jun 2018 20:41:59 +0200</updated>
                            <resolved>Mon, 1 Aug 2016 05:14:06 +0200</resolved>
                                    <version>0.15.2</version>
                                    <fixVersion>0.15.4</fixVersion>
                                                        <votes>1</votes>
                                    <watches>3</watches>
                                                                            <comments>
                            <comment id="454793" author="endless ocean" created="Wed, 23 May 2018 11:15:56 +0200"  >&lt;p&gt;Something similar happens to me exepts with no slime blocks. full blocks seem to be destroyed by&#160; sticky pistons with when the full blocks have snow layers on top and the sticky pistons are on a fast redstine clock.&lt;/p&gt;</comment>
                            <comment id="430865" author="husky2490" created="Wed, 24 Jan 2018 04:42:30 +0100"  >&lt;p&gt;Stroke-by-stroke analysis:&lt;br/&gt;
Stroke 1 (back stroke): piston moves with the machine.&lt;br/&gt;
Stroke 2 (forward stroke): piston moves with the machine.&lt;br/&gt;
Stroke 3: piston moves with the machine.&lt;br/&gt;
Stroke 3.5: piston extends.&lt;br/&gt;
Stroke 4: piston retracts and arm clips into quartz block, unknown behavior upon clipping.&lt;br/&gt;
Stroke 5: piston retracts and deletes quartz block&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-28260?focusedCommentId=430861&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-430861&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;The same machine in a slightly different configuration showing another bug (might be related)&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="430675" author="husky2490" created="Tue, 23 Jan 2018 02:00:28 +0100"  >&lt;p&gt;I think I&apos;ve encountered this in 1.2.9&lt;br/&gt;
Edit: might not be this issue but a related one&lt;br/&gt;
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                            <comment id="322579" author="lewmas fain" created="Fri, 29 Jul 2016 17:28:50 +0200"  >&lt;p&gt;Issue has been resolved as of 0.15.3 or 0.15.4 (i don&apos;t know wich)&lt;/p&gt;</comment>
                            <comment id="321629" author="depressed-pho" created="Fri, 22 Jul 2016 02:07:16 +0200"  >&lt;p&gt;Confirmed on 0.15.2 / iOS. An observer indeed vanished after the machine bounced a couple of times.&lt;/p&gt;

&lt;p&gt;(BTW your report is excellent! I want to say as a moderator this is the best bug report I&apos;ve ever seen. And thank you very much for sharing your great design of bidirectional flying machine and the method of activating two pistons at the same time. I&apos;m really impressed.)&lt;/p&gt;</comment>
                            <comment id="321530" author="lewmas fain" created="Wed, 20 Jul 2016 23:48:14 +0200"  >&lt;p&gt;Oh, I forgot to add to the pictures that the four outer pistons are not sticky, and the two inner ones are. like this&lt;/p&gt;

&lt;p&gt;O = observer  S = Slime&lt;br/&gt;
P = piston       # = sticky piston&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;OP OPO&lt;/tt&gt;&lt;br/&gt;
&lt;tt&gt;SO#SSS&lt;/tt&gt;&lt;br/&gt;
&lt;tt&gt;SSS#OS&lt;/tt&gt;&lt;br/&gt;
&lt;tt&gt;OPO PO&lt;/tt&gt;&lt;/p&gt;</comment>
                    </comments>
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                    <name>Relates</name>
                                            <outwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="142229">MCPE-14654</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="142383">MCPE-14772</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="204270">MCPE-34549</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="122088" name="Broken.png" size="358006" author="Lewmas Fain" created="Wed, 20 Jul 2016 23:35:08 +0200"/>
                            <attachment id="122085" name="Flying machene bug.png" size="292528" author="Lewmas Fain" created="Wed, 20 Jul 2016 23:35:08 +0200"/>
                            <attachment id="155860" name="Minecraft 1_22_2018 6_55_52 PM.mp4" size="3240727" author="husky2490" created="Tue, 23 Jan 2018 01:59:03 +0100"/>
                            <attachment id="122086" name="Repeater.png" size="349274" author="Lewmas Fain" created="Wed, 20 Jul 2016 23:35:08 +0200"/>
                            <attachment id="122089" name="The diagram, and method of powering the blocks at the same time.png" size="533961" author="Lewmas Fain" created="Wed, 20 Jul 2016 23:35:08 +0200"/>
                            <attachment id="122087" name="The flight zone.png" size="714711" author="Lewmas Fain" created="Wed, 20 Jul 2016 23:35:08 +0200"/>
                            <attachment id="122090" name="a block vanished.png" size="505275" author="Lewmas Fain" created="Wed, 20 Jul 2016 23:35:08 +0200"/>
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