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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-11220] Extending piston causes block update</title>
                <link>https://bugs.mojang.com/browse/MC-11220</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;In previous versions of minecraft extending piston didn&apos;t cause block update but now it causes. This breaks compact piston machinery&lt;br/&gt;
How to replicate: Place a pistons in a row and give a redstone signal to middle one&lt;br/&gt;
What used to happen: only piston given signal would extend&lt;br/&gt;
What happens now: adjacend pistons exted too&lt;/p&gt;</description>
                <environment></environment>
        <key id="25332">MC-11220</key>
            <summary>Extending piston causes block update</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="6">Works As Intended</resolution>
                                        <assignee username="grum">[Mojang] Grum (Erik Broes)</assignee>
                                    <reporter username="lemonblock">Joonas Muhonen</reporter>
                        <labels>
                            <label>piston</label>
                            <label>redstone</label>
                    </labels>
                <created>Thu, 7 Mar 2013 15:41:27 +0100</created>
                <updated>Mon, 9 Nov 2015 11:36:11 +0100</updated>
                            <resolved>Mon, 9 Nov 2015 11:36:04 +0100</resolved>
                                    <version>Snapshot 13w10b</version>
                    <version>Minecraft 1.5</version>
                    <version>Minecraft 1.5.1</version>
                    <version>Minecraft 1.5.2</version>
                    <version>Snapshot 13w18c</version>
                    <version>Snapshot 13w19a</version>
                    <version>Minecraft 1.6.1</version>
                    <version>Minecraft 1.6.2</version>
                    <version>Minecraft 1.6.4</version>
                    <version>Minecraft 13w36a</version>
                    <version>Minecraft 13w36b</version>
                    <version>Minecraft 1.7.1</version>
                    <version>Minecraft 1.7.2</version>
                    <version>Minecraft 13w48a</version>
                    <version>Minecraft 13w48b</version>
                    <version>Minecraft 13w49a</version>
                    <version>Minecraft 1.7.3</version>
                    <version>Minecraft 1.7.4</version>
                    <version>Minecraft 14w02a</version>
                    <version>Minecraft 1.7.10</version>
                    <version>Minecraft 14w32d</version>
                    <version>Minecraft 1.8-pre3</version>
                    <version>Minecraft 1.8</version>
                    <version>Minecraft 1.8.3</version>
                                                                        <votes>7</votes>
                                    <watches>4</watches>
                                                                            <comments>
                            <comment id="221454" author="kingsupernova" created="Tue, 10 Mar 2015 00:47:30 +0100"  >&lt;p&gt;Confirmed in 1.8.3. Intended. A block was changed, so it creates an update. People are confusing this bug with &lt;a href=&quot;https://bugs.mojang.com/browse/MC-108&quot; title=&quot;Droppers, Dispensers and Pistons activate when blocks are providing power diagonally or two blocks above&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-108&quot;&gt;&lt;del&gt;MC-108&lt;/del&gt;&lt;/a&gt;. They are actually completely separate bugs, they are just often observed together.&lt;/p&gt;</comment>
                            <comment id="186285" author="itchybrother" created="Fri, 8 Aug 2014 15:22:37 +0200"  >&lt;p&gt;I can confirm that this issue is still a concern with the distributed 1.7.10 client and the 1.7.9 server versions of MineCraft.  Beyond that, I am unable to provide any more information at this time because I am currently traveling.&lt;/p&gt;</comment>
                            <comment id="180310" author="ezekielelin" created="Sat, 26 Jul 2014 20:55:57 +0200"  >&lt;p&gt;Is this still a concern in the latest Minecraft version &lt;b&gt;14w30c&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="86659" author="itchybrother" created="Tue, 9 Jul 2013 00:32:29 +0200"  >&lt;p&gt;Please fix this bug.  It is a REAL pain in the neck.  We have a world implemented with an extensive rail system and ALL of our rail stations use push-button panels to set the rail switches.  The push-buttons are supposed to activate the piston below them, in order to drive the circuitry that sets the rail switches.  This has worked flawlessly ever since the official release, but now it is all broken because pushing one button now causes multiple pistons below to fire.&lt;/p&gt;</comment>
                            <comment id="56114" author="itchybrother" created="Thu, 21 Mar 2013 20:48:06 +0100"  >&lt;p&gt;I wrote up &lt;a href=&quot;https://bugs.mojang.com/browse/MC-11957&quot; title=&quot;Powering a piston from above, will also power adjacent pistons&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-11957&quot;&gt;&lt;del&gt;MC-11957&lt;/del&gt;&lt;/a&gt;, which was quickly deemed a dupe of &lt;a href=&quot;https://bugs.mojang.com/browse/MC-108&quot; title=&quot;Droppers, Dispensers and Pistons activate when blocks are providing power diagonally or two blocks above&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-108&quot;&gt;&lt;del&gt;MC-108&lt;/del&gt;&lt;/a&gt;, but in fact it is exactly the bug described here.&lt;/p&gt;

&lt;p&gt;In my example, I used buttons to fire the pistons.  Rows of pistons above and below a row of buttons.  Select a middle button, and one piston above fires.  Unfortunately, three pistons BELOW will also fire.  This is a big change of behavior.  &lt;/p&gt;</comment>
                            <comment id="52097" author="banana478" created="Tue, 12 Mar 2013 19:12:00 +0100"  >&lt;p&gt;Confirmed.&lt;/p&gt;</comment>
                            <comment id="52084" author="dude" created="Tue, 12 Mar 2013 19:00:38 +0100"  >&lt;p&gt;Confirmed in 1.5pre&lt;/p&gt;</comment>
                            <comment id="50798" author="lemonblock" created="Thu, 7 Mar 2013 20:34:51 +0100"  >&lt;p&gt;But before this wasn&apos;t happening so something must have changed (previously only one piston extendet) now that piston causes block update and that extends adjancent pistons too&lt;/p&gt;</comment>
                            <comment id="50792" author="kumasasa" created="Thu, 7 Mar 2013 20:30:54 +0100"  >&lt;p&gt;This is strongly related to &lt;a href=&quot;https://bugs.mojang.com/browse/MC-108&quot; title=&quot;Droppers, Dispensers and Pistons activate when blocks are providing power diagonally or two blocks above&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-108&quot;&gt;&lt;del&gt;MC-108&lt;/del&gt;&lt;/a&gt;, since powered blocks diagonally over the pistons will extend them.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="28423">MC-13349</issuekey>
        </issuelink>
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                            <issuelinktype id="10103">
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            <issuekey id="11353">MC-108</issuekey>
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                <attachments>
                            <attachment id="23753" name="2013-03-06_21.26.41.png" size="225685" author="lemonblock" created="Thu, 7 Mar 2013 15:41:27 +0100"/>
                            <attachment id="23754" name="2013-03-06_21.27.03.png" size="183868" author="lemonblock" created="Thu, 7 Mar 2013 15:41:27 +0100"/>
                            <attachment id="24275" name="2013-03-12_14.11.30.png" size="119362" author="banana478" created="Tue, 12 Mar 2013 19:12:24 +0100"/>
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