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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-3961] Water, Cobwebs, Magma, Leaves and other blocks save sunlight</title>
                <link>https://bugs.mojang.com/browse/MC-3961</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #FFFFCE;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #F7D6C1;&quot;&gt;&lt;b&gt;Note&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #FFFFCE;&quot;&gt;
&lt;p&gt;This issue is about &lt;b&gt;sunlight&lt;/b&gt;.  For the related block light issue, see &lt;a href=&quot;https://bugs.mojang.com/browse/MC-102162&quot; title=&quot;Some light-emitting blocks (magma, lit furnace, lit redstone ore) &amp;#39;save&amp;#39; block light&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-102162&quot;&gt;&lt;del&gt;MC-102162&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h3&gt;&lt;a name=&quot;Thebug&quot;&gt;&lt;/a&gt;The bug&lt;/h3&gt;

&lt;p&gt;Certain blocks &quot;save&quot; sunlight, emiting it even after the original source has been removed.  This creates an annoying glowing spot and is &lt;em&gt;very&lt;/em&gt; difficult to clean up given that the blocks are not obviously the source of the glowing (and that it can chain between multiple of them).&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;Affectedblocks%28maybeincomplete%29&quot;&gt;&lt;/a&gt;Affected blocks (may be incomplete)&lt;/h3&gt;

&lt;ul&gt;
	&lt;li&gt;Water&lt;/li&gt;
	&lt;li&gt;Leaves&lt;/li&gt;
	&lt;li&gt;Cobweb&lt;/li&gt;
	&lt;li&gt;Magma&lt;/li&gt;
	&lt;li&gt;Lit redstone ore&lt;/li&gt;
	&lt;li&gt;Lit furnace&lt;/li&gt;
	&lt;li&gt;Powered redstone lamp&lt;/li&gt;
	&lt;li&gt;Glowstone&lt;/li&gt;
	&lt;li&gt;Sea lantern&lt;/li&gt;
	&lt;li&gt;Jack-o-lantern&lt;/li&gt;
&lt;/ul&gt;



&lt;h3&gt;&lt;a name=&quot;Reproduction&quot;&gt;&lt;/a&gt;Reproduction&lt;/h3&gt;

&lt;ol&gt;
	&lt;li&gt;Build a sealed room without any lights in it with a single layer between it and the sky.&lt;/li&gt;
	&lt;li&gt;Place one of the effected blocks on the floor.&lt;/li&gt;
	&lt;li&gt;Break the ceiling block above that block.&lt;/li&gt;
	&lt;li&gt;Replace the ceiling block.&lt;/li&gt;
	&lt;li&gt;Observe that the room remains lit, despite the lack of a light source.&lt;/li&gt;
&lt;/ol&gt;


&lt;h3&gt;&lt;a name=&quot;Notes&quot;&gt;&lt;/a&gt;Notes&lt;/h3&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;del&gt;In versions prior to 1.7.2ish, this also affected other blocks (for sure glowstone, lit redstone ore, lit furnaces, and jack &apos;o lanterns &amp;#8212; mostly, blocks that exhibit &lt;a href=&quot;https://bugs.mojang.com/browse/MC-102162&quot; title=&quot;Some light-emitting blocks (magma, lit furnace, lit redstone ore) &amp;#39;save&amp;#39; block light&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-102162&quot;&gt;&lt;del&gt;MC-102162&lt;/del&gt;&lt;/a&gt; but also similar blocks that emit full light).  In 1.7.2 it was fixed for &lt;em&gt;those&lt;/em&gt; blocks.  Incidentally, 1.7.2 had a fix that removed an x-ray effect when inside of glowstone; it&apos;s possible that those are related.&lt;/del&gt; this issue returned for 1.11.2&lt;/li&gt;
	&lt;li&gt;Lava is not effected, despite also being a fluid.&lt;/li&gt;
	&lt;li&gt;Water only finicky about being affected; if it&apos;s in a pit it doesn&apos;t get affected but if it&apos;s above the ground it is.&lt;/li&gt;
	&lt;li&gt;This only happens when the block is in &lt;em&gt;direct&lt;/em&gt; sunlight; if it&apos;s next to the sunlight but not exposed to the sun it doesn&apos;t seem to happen.&lt;/li&gt;
&lt;/ul&gt;


&lt;h3&gt;&lt;a name=&quot;Demos&quot;&gt;&lt;/a&gt;Demos&lt;/h3&gt;

&lt;p&gt;Demonstration from the Minecraft version 1.4.5 : &lt;a href=&quot;http://youtu.be/8nTd1KbbrLA&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://youtu.be/8nTd1KbbrLA&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;EDIT SEPT 19 2015: Demonstration from the Minecraft version 15w38b: &lt;a href=&quot;https://youtu.be/bPUdssOvU78&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://youtu.be/bPUdssOvU78&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="16245">MC-3961</key>
            <summary>Water, Cobwebs, Magma, Leaves and other blocks save sunlight</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="fry">[Mojang] Georgii Gavrichev</assignee>
                                    <reporter username="min666645">Hinata</reporter>
                        <labels>
                            <label>cobweb</label>
                            <label>leaves</label>
                            <label>light</label>
                            <label>magma_block</label>
                            <label>sky</label>
                            <label>water</label>
                    </labels>
                <created>Thu, 29 Nov 2012 13:11:01 +0100</created>
                <updated>Tue, 23 Oct 2018 18:57:30 +0200</updated>
                            <resolved>Tue, 23 Oct 2018 18:57:29 +0200</resolved>
                                    <version>Minecraft 1.4.5</version>
                    <version>Minecraft 1.4.7</version>
                    <version>Snapshot 13w05b</version>
                    <version>Minecraft 1.5</version>
                    <version>Snapshot 13w11a</version>
                    <version>Minecraft 1.7.5</version>
                    <version>Minecraft 14w11b</version>
                    <version>Minecraft 14w21b</version>
                    <version>Minecraft 1.7.10</version>
                    <version>Minecraft 14w28a</version>
                    <version>Minecraft 14w28b</version>
                    <version>Minecraft 1.8</version>
                    <version>Minecraft 1.8.1-pre3</version>
                    <version>Minecraft 1.8.1</version>
                    <version>Minecraft 1.8.2-pre6</version>
                    <version>Minecraft 15w38b</version>
                    <version>Minecraft 15w47c</version>
                    <version>Minecraft 1.9 Pre-Release 1</version>
                    <version>Minecraft 1.10</version>
                    <version>Minecraft 1.10.2</version>
                    <version>Minecraft 16w32a</version>
                    <version>Minecraft 16w32b</version>
                    <version>Minecraft 16w33a</version>
                    <version>Minecraft 16w35a</version>
                    <version>Minecraft 16w44a</version>
                    <version>Minecraft 1.11.2</version>
                    <version>Minecraft 17w06a</version>
                    <version>Minecraft 17w13a</version>
                    <version>Minecraft 17w13b</version>
                    <version>Minecraft 17w14a</version>
                    <version>Minecraft 17w15a</version>
                    <version>Minecraft 17w16a</version>
                    <version>Minecraft 17w17b</version>
                    <version>Minecraft 17w18a</version>
                    <version>Minecraft 17w18b</version>
                    <version>Minecraft 1.12 Pre-Release 1</version>
                    <version>Minecraft 1.12 Pre-Release 2</version>
                    <version>Minecraft 1.12 Pre-Release 3</version>
                    <version>Minecraft 1.12 Pre-Release 4</version>
                    <version>Minecraft 1.12 Pre-Release 5</version>
                    <version>Minecraft 1.12 Pre-Release 6</version>
                    <version>Minecraft 1.12 Pre-Release 7</version>
                    <version>Minecraft 1.12</version>
                    <version>Minecraft 17w31a</version>
                    <version>Minecraft 1.12.1 Pre-Release 1</version>
                    <version>Minecraft 1.12.1</version>
                    <version>Minecraft 1.12.2 Pre-Release 1</version>
                    <version>Minecraft 1.12.2 Pre-Release 2</version>
                    <version>Minecraft 1.12.2</version>
                    <version>Minecraft 17w43a</version>
                    <version>Minecraft 17w43b</version>
                    <version>Minecraft 17w45a</version>
                    <version>Minecraft 17w48a</version>
                    <version>Minecraft 17w50a</version>
                    <version>Minecraft 18w01a</version>
                    <version>Minecraft 18w03b</version>
                    <version>Minecraft 18w06a</version>
                    <version>Minecraft 18w09a</version>
                    <version>Minecraft 18w16a</version>
                    <version>Minecraft 1.13-pre1</version>
                    <version>Minecraft 1.13-pre3</version>
                    <version>Minecraft 1.13-pre10</version>
                    <version>Minecraft 1.13</version>
                    <version>Minecraft 18w30b</version>
                    <version>Minecraft 18w31a</version>
                    <version>Minecraft 1.13.1</version>
                                    <fixVersion>Minecraft 18w43a</fixVersion>
                                                        <votes>49</votes>
                                    <watches>19</watches>
                                                                            <comments>
                            <comment id="438862" author="farogaming" created="Fri, 2 Mar 2018 22:04:40 +0100"  >&lt;p&gt;No, it&apos;s a bug and the blog author was already notified.&lt;/p&gt;</comment>
                            <comment id="438851" author="somebody62" created="Fri, 2 Mar 2018 20:45:47 +0100"  >&lt;p&gt;Redstone ore is supposed to do this, according to Minecraft.net &lt;a href=&quot;https://minecraft.net/en-us/article/block-week-redstone&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. However, this may be wrong, because I doubt the author would know definitively what the desired behavior should be here.&lt;/p&gt;</comment>
                            <comment id="405979" author="violine1101" created="Thu, 7 Sep 2017 23:50:05 +0200"  >&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=carson_he&quot; class=&quot;user-hover&quot; rel=&quot;carson_he&quot;&gt;carson_he&lt;/a&gt;, 1.12.1 has already been marked as affected.&lt;/p&gt;</comment>
                            <comment id="405976" author="carson_he" created="Thu, 7 Sep 2017 23:35:34 +0200"  >&lt;p&gt;Confirmed for 1.12.1&lt;/p&gt;</comment>
                            <comment id="314158" author="helios77" created="Thu, 16 Jun 2016 16:10:31 +0200"  >&lt;p&gt;Confirmed for 1.10, glowstone not affected. You can see the result with cobweb on this video : &lt;a href=&quot;https://youtu.be/fZa-kKz-K3E&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://youtu.be/fZa-kKz-K3E&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;What i think is that when the ceiling is sealed, all the air blocks&apos;s light level underneath are updated but they omit other blocks (for optimisation purpose)  so cobweb is not updated except if you place the block just above it (for glass and other stuff it works though)&lt;/p&gt;

&lt;p&gt;F3 confirms that the light is skylight, not block light&lt;/p&gt;</comment>
                            <comment id="306308" author="JIRAUSER71590" created="Sat, 21 May 2016 17:47:35 +0200"  >&lt;p&gt;Please mark both videos (&lt;a href=&quot;https://youtu.be/bPUdssOvU78&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://youtu.be/bPUdssOvU78&lt;/a&gt; and &lt;a href=&quot;http://youtu.be/8nTd1KbbrLA&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://youtu.be/8nTd1KbbrLA&lt;/a&gt;) as either public or hidden, if it&apos;s private, we can&apos;t watch them.&lt;/p&gt;</comment>
                            <comment id="286844" author="immaterialise" created="Wed, 17 Feb 2016 20:26:54 +0100"  >&lt;p&gt;Confirmed for 1.9-pre1, although glowstone doesn&apos;t seem to be affected anymore. It still occurs with water and cobwebs.&lt;/p&gt;</comment>
                            <comment id="269189" author="icemetalpunk" created="Mon, 30 Nov 2015 07:46:14 +0100"  >&lt;p&gt;Confirmed in 15w47c. It interferes with the operation of daylight sensors, which think the &quot;saved&quot; light from glowstone, etc. are daylight and emit a signal where there should be none. It&apos;s also difficult to fix once it occurs, because the &quot;sky light&quot; emitting from one block of glowstone will be &quot;saved&quot; as &quot;sky light&quot; in nearby blocks, so they must all be broken before you can replace them or else it&apos;ll still think there&apos;s skylight around.&lt;/p&gt;</comment>
                            <comment id="250742" author="min666645" created="Sat, 19 Sep 2015 09:55:33 +0200"  >&lt;p&gt;Bug still confirmed in 15w38b. It&apos;s been 3 years, maybe it&apos;s time to fix it, Mojang?&lt;/p&gt;</comment>
                            <comment id="183914" author="kazblox" created="Sat, 2 Aug 2014 18:10:51 +0200"  >&lt;p&gt;EDIT: wait no, I was wrong&lt;/p&gt;</comment>
                            <comment id="174462" author="cultist_o" created="Tue, 15 Jul 2014 02:49:30 +0200"  >&lt;p&gt;this is still a problem in 1.7.10 and 14w28b&lt;/p&gt;</comment>
                            <comment id="161760" author="whomper5" created="Thu, 5 Jun 2014 22:48:20 +0200"  >&lt;p&gt;I can also confirm for 14w21b. Additionally powered redstone blocks act as transparent and exhibit this behavior. It seems that transparent blocks often do not update their light level, thus preserving previous sky light levels. &lt;/p&gt;

&lt;p&gt;I&apos;ve had this same problem with stained glass but am having trouble duplicating it.&lt;/p&gt;</comment>
                            <comment id="161709" author="missingno_26" created="Thu, 5 Jun 2014 16:07:21 +0200"  >&lt;p&gt;can confirm for 14w21b&lt;/p&gt;</comment>
                            <comment id="136151" author="ezekielelin" created="Wed, 29 Jan 2014 17:55:12 +0100"  >&lt;p&gt;Is this still a concern in the latest Minecraft version &lt;b&gt;14w04b&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="42952" author="projayjay" created="Sat, 2 Feb 2013 22:55:30 +0100"  >&lt;p&gt;Confirmed&lt;/p&gt;</comment>
                            <comment id="25686" author="cubethethird" created="Thu, 29 Nov 2012 13:48:05 +0100"  >&lt;p&gt;Can confirm.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="28750">MC-13574</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="41868">MC-22737</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="82918">MC-56362</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="105764">MC-77178</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="155820">MC-110343</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="157914">MC-111503</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="165954">MC-114780</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="178991">MC-120269</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="191009">MC-124484</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="199823">MC-129147</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10103">
                    <name>Relates</name>
                                            <outwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="141055">MC-102162</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="170122">MC-117067</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="27924">MC-13003</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="36913">MC-18526</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="105939">MC-77311</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="177556">MC-119932</issuekey>
        </issuelink>
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