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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-14022] Covering roof of spawn chamber with bottom-half slabs severely reduces the spawn rate</title>
                <link>https://bugs.mojang.com/browse/MCPE-14022</link>
                <project id="10200" key="MCPE">Minecraft (Bedrock codebase)</project>
                    <description>&lt;p&gt;Everyone knows that mobs cannot spawn on top of bottom-half slabs. But in this specific case mobs hardly spawn at all &lt;b&gt;below&lt;/b&gt; solid opaque blocks with a bottom-half slab on top of it. This somewhat relates to &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-12422&quot; title=&quot;Vertical distance is ignored by the hostile mobs spawning rule&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-12422&quot;&gt;&lt;del&gt;MCPE-12422&lt;/del&gt;&lt;/a&gt; and now-fixed &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-11112&quot; title=&quot;Hostile mobs don&amp;#39;t spawn underground during day&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-11112&quot;&gt;&lt;del&gt;MCPE-11112&lt;/del&gt;&lt;/a&gt; but is clearly not the same.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Steps to reproduce:&lt;/b&gt;&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Build a 12x12x3 spawn chamber out of any kind of solid opaque blocks.&lt;/li&gt;
	&lt;li&gt;Optionally place tripwire and redstone lamps to ease observing mobs inside it.&lt;/li&gt;
	&lt;li&gt;Take 24 blocks away from it and wait 10 seconds or so.&lt;/li&gt;
	&lt;li&gt;Observe that mobs start to spawn in the chamber.&lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;115019_thumb&quot; href=&quot;https://bugs.mojang.com/secure/attachment/115019/115019_chamber-A.png&quot; title=&quot;chamber-A.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;115019&quot; file-preview-title=&quot;chamber-A.png&quot;&gt;&lt;img src=&quot;https://bugs.mojang.com/secure/thumbnail/115019/_thumb_115019.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt; &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;115020_thumb&quot; href=&quot;https://bugs.mojang.com/secure/attachment/115020/115020_chamber-A-inside.png&quot; title=&quot;chamber-A-inside.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;115020&quot; file-preview-title=&quot;chamber-A-inside.png&quot;&gt;&lt;img src=&quot;https://bugs.mojang.com/secure/thumbnail/115020/_thumb_115020.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt;&lt;/li&gt;
	&lt;li&gt;Now cover the roof of chamber with any kind of bottom-half slabs.&lt;/li&gt;
	&lt;li&gt;Take 24 blocks away from it and wait for mobs again.&lt;/li&gt;
	&lt;li&gt;Observe that the spawn rate has severely reduced. Now it takes several tens of minutes to spawn even a single mob.&lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;115021_thumb&quot; href=&quot;https://bugs.mojang.com/secure/attachment/115021/115021_chamber-B.png&quot; title=&quot;chamber-B.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;115021&quot; file-preview-title=&quot;chamber-B.png&quot;&gt;&lt;img src=&quot;https://bugs.mojang.com/secure/thumbnail/115021/_thumb_115021.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt; &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;115022_thumb&quot; href=&quot;https://bugs.mojang.com/secure/attachment/115022/115022_chamber-B-inside.png&quot; title=&quot;chamber-B-inside.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;115022&quot; file-preview-title=&quot;chamber-B-inside.png&quot;&gt;&lt;img src=&quot;https://bugs.mojang.com/secure/thumbnail/115022/_thumb_115022.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&lt;b&gt;What I expected:&lt;/b&gt;&lt;br/&gt;
Slabs on the roof do not affect the spawn rate at all.&lt;/p&gt;

&lt;p&gt;Note that the inner height of spawn chamber needs to be 3 blocks or higher in order to trigger this bug. If it&apos;s only 2 blocks high, slabs don&apos;t affect the spawn rate as expected.&lt;/p&gt;</description>
            <key id="138510">MCPE-14022</key>
            <summary>Covering roof of spawn chamber with bottom-half slabs severely reduces the spawn rate</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="depressed-pho">PHO</reporter>
                        <labels>
                            <label>entity-spawning</label>
                            <label>slab</label>
                    </labels>
                <created>Thu, 31 Mar 2016 14:51:08 +0200</created>
                <updated>Thu, 13 Apr 2017 16:37:44 +0200</updated>
                            <resolved>Thu, 13 Apr 2017 16:37:44 +0200</resolved>
                                    <version>0.14.0</version>
                    <version>0.14.1</version>
                    <version>0.14.2</version>
                    <version>0.14.3</version>
                    <version>0.15.4</version>
                    <version>1.0.2</version>
                    <version>1.0.3</version>
                                    <fixVersion>1.0.6.52</fixVersion>
                                                        <votes>3</votes>
                                    <watches>4</watches>
                                                                            <comments>
                            <comment id="377770" author="depressed-pho" created="Thu, 13 Apr 2017 16:37:44 +0200"  >&lt;p&gt;Yes I confirmed it&apos;s been fixed.&lt;br/&gt;
Thank you &lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=rboxman&quot; class=&quot;user-hover&quot; rel=&quot;rboxman&quot;&gt;rboxman&lt;/a&gt; for testing the bug &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="377736" author="rboxman" created="Thu, 13 Apr 2017 09:49:06 +0200"  >&lt;p&gt;This may be fixed as it&apos;s listed in the 1.0.6 changelog.  I tried OPs Chamber-B design (full blocks covered by half-slabs for the roof) and I&apos;m getting spawns inside my enclosed room relatively quickly.  I don&apos;t have a full size farm though so it would be good to get a second opinion here.&lt;/p&gt;</comment>
                            <comment id="370113" author="rboxman" created="Tue, 28 Feb 2017 22:04:17 +0100"  >&lt;p&gt;Related to the fact that half-slabs in Pocket Edition do not block light and it&apos;s still present in 1.0.3...&lt;/p&gt;</comment>
                            <comment id="357938" author="depressed-pho" created="Tue, 7 Feb 2017 13:02:52 +0100"  >&lt;p&gt;Test world attached.&lt;/p&gt;</comment>
                            <comment id="356389" author="eldon96" created="Sun, 29 Jan 2017 15:34:47 +0100"  >&lt;p&gt;Confirmed in 1.0.2. Made Mumbo Jumbo&apos;s mob spawned design. Spawn rates very low to begin with but add a bottom half slab roof at any height and spawning halts completely.&lt;/p&gt;</comment>
                            <comment id="344039" author="aman4700" created="Fri, 18 Nov 2016 05:34:10 +0100"  >&lt;p&gt;This is a bulk resolve of issues that haven&apos;t been updated to 0.16.0+ yet. Please comment below (To open the ticket) and update your affected versions. If you cannot reproduce the bug, please write in the comments so we can resolve it as &quot;Cannot Reproduce&quot;. Thank You!&lt;/p&gt;</comment>
                            <comment id="323692" author="aman4700" created="Mon, 8 Aug 2016 03:48:58 +0200"  >&lt;p&gt;Please respond and add the current version if you can reproduce this issue.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="162476">MCPE-19950</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10103">
                    <name>Relates</name>
                                            <outwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="124481">MCPE-11112</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="141477">MCPE-14467</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="146022">MCPE-16077</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="131512">MCPE-12422</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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                            <attachment id="133298" name="Slabbled-Roof-Glitch.mcworld" size="75994" author="depressed-pho" created="Tue, 7 Feb 2017 13:17:24 +0100"/>
                            <attachment id="115020" name="chamber-A-inside.png" size="1423253" author="depressed-pho" created="Thu, 31 Mar 2016 14:51:08 +0200"/>
                            <attachment id="115019" name="chamber-A.png" size="692966" author="depressed-pho" created="Thu, 31 Mar 2016 14:51:08 +0200"/>
                            <attachment id="115022" name="chamber-B-inside.png" size="1333506" author="depressed-pho" created="Thu, 31 Mar 2016 14:51:08 +0200"/>
                            <attachment id="115021" name="chamber-B.png" size="696098" author="depressed-pho" created="Thu, 31 Mar 2016 14:51:08 +0200"/>
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