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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-1971] High altitude mob spawning inconsistencies</title>
                <link>https://bugs.mojang.com/browse/MC-1971</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;I have noticed inconsistencies with mob spawning at certain Y-values (higher altitudes).&lt;/p&gt;

&lt;p&gt;I will explain how I noticed it - I started to build a simple dark room mob trap - the &quot;collection area&quot; was at y-190 above an ocean biome - I then stacked up 23 blocks and built a simple mob trap.&lt;/p&gt;

&lt;p&gt;Once the spawning pads were done and it was fully dark I climbed back down...&lt;/p&gt;

&lt;p&gt;What did I expect to happen? The mob spawner to be dropping mobs like mad - the only spawnable space close to me was in that constructed mob trap. &lt;/p&gt;

&lt;p&gt;What actually happened: Nothing - no mobs spawned. I relogged several times - checked the spawning pads for light but no mobs would spawn.&lt;/p&gt;

&lt;p&gt;I know that mobs become idle at a certain radius but I built it well within that radius.&lt;/p&gt;

&lt;p&gt;I also know that no mobs spawn at 240 and above but again the spawning pads were not built anywhere close to that.&lt;/p&gt;

&lt;p&gt;Also the spawning pads were 24 blocks away from me - It wasn&apos;t a case of me being too close&lt;/p&gt;</description>
                <environment>Mac OSX and Windows 7 - Java 7</environment>
        <key id="13352">MC-1971</key>
            <summary>High altitude mob spawning inconsistencies</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="arii1986">Aaron Braund</reporter>
                        <labels>
                            <label>high</label>
                            <label>spawning</label>
                    </labels>
                <created>Fri, 2 Nov 2012 21:22:35 +0100</created>
                <updated>Sun, 3 May 2015 06:24:21 +0200</updated>
                            <resolved>Tue, 5 Feb 2013 02:21:32 +0100</resolved>
                                    <version>Minecraft 1.4.2</version>
                    <version>Minecraft 1.4.3</version>
                                                                        <votes>1</votes>
                                    <watches>2</watches>
                                                                            <comments>
                            <comment id="18844" author="sidben" created="Tue, 6 Nov 2012 20:07:59 +0100"  >&lt;p&gt;Oh yeah? I&apos;ll need to revisit my sky trap then, but looked like it was working full power.&lt;/p&gt;</comment>
                            <comment id="18836" author="arii1986" created="Tue, 6 Nov 2012 19:46:53 +0100"  >&lt;p&gt;Yes I did initially try the antenna trick at first but that doesn&apos;t seem to work anymore - in fact a lot of people have commented on that video that the antenna no longer works - I suspect 1.4 had something to do with it&lt;/p&gt;</comment>
                            <comment id="18833" author="sidben" created="Tue, 6 Nov 2012 19:36:56 +0100"  >&lt;p&gt;Also, you can build some &quot;antennas&quot;. If you place a few blocks above your trap, you&apos;ll keep that chunks loaded and the trap will work.&lt;/p&gt;</comment>
                            <comment id="18820" author="arii1986" created="Tue, 6 Nov 2012 18:21:35 +0100"  >&lt;p&gt;Wow thanks for the share! &lt;img class=&quot;emoticon&quot; src=&quot;https://bugs.mojang.com/images/icons/emoticons/tongue.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt; - this actually fixed it - how strange, this can&apos;t be intentional though&lt;/p&gt;</comment>
                            <comment id="18814" author="raffa256" created="Tue, 6 Nov 2012 18:00:02 +0100"  >&lt;p&gt;Ok I found a solution.&lt;br/&gt;
Acording to this thread &quot;mob spawn rates are tied into the number of chunks loaded in memory&quot;&lt;br/&gt;
&lt;a href=&quot;http://www.minecraftforum.net/topic/1551224-mob-spawn-fairly-much-non-existant-on-survival-142-server/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.minecraftforum.net/topic/1551224-mob-spawn-fairly-much-non-existant-on-survival-142-server/&lt;/a&gt;&lt;br/&gt;
So just increase your render distance and/or view distance (if server) and mobs will start to flow down =P&lt;br/&gt;
Not sure this is intended though.&lt;/p&gt;</comment>
                            <comment id="17763" author="raffa256" created="Sat, 3 Nov 2012 20:54:01 +0100"  >&lt;p&gt;Hi I&apos;m having the same issue.&lt;br/&gt;
I have a mob trap starting at Y=95, all caves around have been lit so its the only possible spawning space.&lt;br/&gt;
When I enter the game some mobs spawn but after that it almost stops, only 1 or 2 mobs spawn if I&apos;m lucky.&lt;br/&gt;
Using Rei minimap I can see that there are no mobs anywhere else.&lt;br/&gt;
However if I move near chunks that have unlit caves monsters start to spawn on those chunks.&lt;br/&gt;
I&apos;ve had this trap since 1.2.4 and until the last update it worked fine.&lt;/p&gt;</comment>
                            <comment id="17569" author="arii1986" created="Sat, 3 Nov 2012 11:01:45 +0100"  >&lt;p&gt;This is the mob spawner - as you can see I am y-160 - the mob trap is at around 184 - there are no mobs spawning.&lt;/p&gt;</comment>
                            <comment id="17564" author="arii1986" created="Sat, 3 Nov 2012 10:52:34 +0100"  >&lt;p&gt;Okay so I built another grinder - this time I built the collection area at Y-160 with a 24 block drop above (at about 184) to kill the mobs - what&apos;s weird is that I will get about 8 mobs falling and then after that it just stops.... I have tested this in both singleplayer and multiplayer (with only me on the server) and same results...&lt;/p&gt;

&lt;p&gt;I guess the most frustrating thing about it is that I spent so long building and designing the trap just to see no spawns - I will include a picture of the mob trap above&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="14219">MC-2536</issuekey>
        </issuelink>
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                                                        </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="11973" name="Screen shot 2012-11-03 at 10.00.29.png" size="762678" author="arii1986" created="Sat, 3 Nov 2012 11:01:45 +0100"/>
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