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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-3667] Light-emitting blocks don&apos;t emit light while being moved by a piston, causing flickering</title>
                <link>https://bugs.mojang.com/browse/MC-3667</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;h3&gt;&lt;a name=&quot;Thebug&quot;&gt;&lt;/a&gt;The bug&lt;/h3&gt;

&lt;p&gt;Upon pushing or pulling a light-emitting block (see below for affected blocks), the light flickers off while it is moving. This can cause performance issues due to excessive lighting updates, as well as just be undesirable in general.&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Howtoreproduce&quot;&gt;&lt;/a&gt;How to reproduce&lt;/h3&gt;
&lt;ol&gt;
	&lt;li&gt;Construct the contraption shown in &lt;a href=&quot;https://youtu.be/x-51gGJ7Y7E&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this video&lt;/a&gt;&#160;if testing redstone lamps, or the simple contraption shown in &lt;a href=&quot;https://bugs.mojang.com/secure/attachment/338498/2020-09-24_20.39.29.png&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this screenshot&lt;/a&gt;&#160;if testing Shroomlights or any other blocks&lt;/li&gt;
	&lt;li&gt;Notice how the redstone lamp flickers every time it is pushed by the piston&lt;/li&gt;
	&lt;li&gt;Replace the redstone lamp with any other light-emitting block from the list below and notice how this same behaviour is present&lt;/li&gt;
&lt;/ol&gt;


&lt;h3&gt;&lt;a name=&quot;Affectedblocks&quot;&gt;&lt;/a&gt;Affected blocks&lt;/h3&gt;
&lt;ul&gt;
	&lt;li&gt;Redstone Lamp (lit)&lt;/li&gt;
	&lt;li&gt;Shroomlight&lt;/li&gt;
	&lt;li&gt;Sea Lantern&lt;/li&gt;
	&lt;li&gt;Glowstone&lt;/li&gt;
	&lt;li&gt;Redstone Ore (lit)&lt;/li&gt;
	&lt;li&gt;Magma Block&lt;/li&gt;
&lt;/ul&gt;


&lt;h5&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h5&gt;

&lt;p&gt;Using the setup in the screenshot, the lamp will flicker when the lever is pulled.&lt;/p&gt;

&lt;p&gt;Glowstone sometimes exhibits this behavior.&lt;/p&gt;</description>
                <environment></environment>
        <key id="15793">MC-3667</key>
            <summary>Light-emitting blocks don&apos;t emit light while being moved by a piston, causing flickering</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="markderickson">[Mod] markderickson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Nov 2012 04:47:48 +0100</created>
                <updated>Wed, 30 Sep 2020 21:36:18 +0200</updated>
                            <resolved>Wed, 30 Sep 2020 21:35:53 +0200</resolved>
                                    <version>Minecraft 1.4.5</version>
                    <version>Snapshot 12w50a</version>
                    <version>Minecraft 1.4.6</version>
                    <version>Minecraft 1.4.7</version>
                    <version>Minecraft 1.5</version>
                    <version>Minecraft 1.8.1</version>
                    <version>Minecraft 1.8.3</version>
                    <version>1.16.3</version>
                                                                        <votes>4</votes>
                                    <watches>11</watches>
                                                                            <comments>
                            <comment id="819364" author="suncat" created="Wed, 30 Sep 2020 21:35:53 +0200"  >&lt;p&gt;merged with &lt;a href=&quot;https://bugs.mojang.com/browse/MC-123217&quot; title=&quot;Moving blocks don&amp;#39;t inherit behaviors of the block they hold&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-123217&quot;&gt;MC-123217&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="807234" author="JIRAUSER506241" created="Wed, 16 Sep 2020 15:06:16 +0200"  >&lt;p&gt;Thanks!&lt;/p&gt;</comment>
                            <comment id="807232" author="suncat" created="Wed, 16 Sep 2020 15:03:43 +0200"  >&lt;p&gt;The ticket is yours now&lt;/p&gt;</comment>
                            <comment id="807227" author="JIRAUSER506241" created="Wed, 16 Sep 2020 14:57:03 +0200"  >&lt;p&gt;Hi! I&apos;d like to request ownership of this report.&lt;/p&gt;</comment>
                            <comment id="222186" author="searge" created="Tue, 17 Mar 2015 11:58:02 +0100"  >&lt;p&gt;While being moved by pistons, blocks do not emit light.&lt;/p&gt;</comment>
                            <comment id="220146" author="redstoneexplorer" created="Tue, 24 Feb 2015 06:44:57 +0100"  >&lt;p&gt;Happens in 1.8.3 and affects sea lanterns as well as glowstone and redstone lamps. It seems that it does not matter whether the piston pushes or pulls these blocks, the flicker happens either way. I tested this using each set up in the screen shot separately. Hopefully I&apos;m not misunderstanding this issue.&lt;/p&gt;</comment>
                            <comment id="206572" author="galaxy_2alex" created="Thu, 30 Oct 2014 17:48:41 +0100"  >&lt;p&gt;Is this still a concern in the &lt;em&gt;current Minecraft version&lt;/em&gt;? 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. If this has been done, we can reopen the issue.&lt;/p&gt;

&lt;p&gt;Keep in mind that the &quot;Resolved&quot;-Status on this ticket just means &quot;Answered&quot;, and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been deliviered.&lt;/p&gt;</comment>
                            <comment id="50701" author="shufboyardee" created="Thu, 7 Mar 2013 16:26:39 +0100"  >&lt;p&gt;also in 1.5.&lt;/p&gt;</comment>
                            <comment id="45725" author="shufboyardee" created="Thu, 14 Feb 2013 17:20:32 +0100"  >&lt;p&gt;In 13w07a, both these blocks flicker, and both when being pushed and pulled.&lt;/p&gt;</comment>
                            <comment id="26422" author="firehunterx" created="Mon, 3 Dec 2012 14:24:25 +0100"  >&lt;p&gt;Yes, it only works when being PULLED by a piston, not pushed.&lt;/p&gt;</comment>
                            <comment id="24237" author="chalmes" created="Thu, 22 Nov 2012 21:56:42 +0100"  >&lt;p&gt;I can&apos;t get the glowstone lamp to flicker going up.  I can see the bottom redstone lamp going on a few ticks before the glowstone lamp turns on, which makes it look a little inconsistent, but the glowstone lamp only flickers for me when coming back down.&lt;/p&gt;</comment>
                            <comment id="24229" author="banana478" created="Thu, 22 Nov 2012 21:41:04 +0100"  >&lt;p&gt;Glowstone flickers both ways, redstone lamps flicker only down.&lt;/p&gt;</comment>
                            <comment id="24224" author="chalmes" created="Thu, 22 Nov 2012 21:27:08 +0100"  >&lt;p&gt;Flickers on the way back down again right?&lt;/p&gt;</comment>
                            <comment id="24128" author="banana478" created="Thu, 22 Nov 2012 16:01:00 +0100"  >&lt;p&gt;Confirmed. The glowstone and the lamp don&apos;t appear to flicker, but you can see that the light flickers if you set the time to midnight.&lt;/p&gt;</comment>
                            <comment id="24120" author="firehunterx" created="Thu, 22 Nov 2012 15:23:37 +0100"  >&lt;p&gt;Updated.&lt;/p&gt;</comment>
                            <comment id="24068" author="dlminecr" created="Thu, 22 Nov 2012 07:01:03 +0100"  >&lt;p&gt;Also happens with glowstone.&lt;/p&gt;</comment>
                            <comment id="24055" author="firehunterx" created="Thu, 22 Nov 2012 06:18:55 +0100"  >&lt;p&gt;Delivered. &lt;/p&gt;

&lt;p&gt;Don&apos;t know what exactly happened, I uploaded it already.&lt;/p&gt;</comment>
                            <comment id="24052" author="cubethethird" created="Thu, 22 Nov 2012 05:55:43 +0100"  >&lt;p&gt;Can you post said screenshot?&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="188323">MC-123217</issuekey>
        </issuelink>
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                <attachments>
                            <attachment id="14040" name="2012-11-21_22.46.04.png" size="218533" author="firehunterx" created="Thu, 22 Nov 2012 06:17:29 +0100"/>
                            <attachment id="89134" name="2015-02-23_23.42.19.png" size="563945" author="RedstoneExplorer" created="Tue, 24 Feb 2015 06:41:46 +0100"/>
                            <attachment id="338498" name="2020-09-24_20.39.29.png" size="317344" author="markderickson" created="Fri, 25 Sep 2020 02:42:25 +0200"/>
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