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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-10786] Comparator doesn&apos;t update when a hopper takes in only part of an item stack</title>
                <link>https://bugs.mojang.com/browse/MC-10786</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;If you throw a stack of items into a hopper that can&apos;t take in all the items from the stack (because the hopper is full), it will correctly take in as much items as it can, but connected comparators won&apos;t update.&lt;/p&gt;

&lt;p&gt;Reproduction steps:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;place a hopper, a comparator and 15 redstone for visualization&lt;/li&gt;
	&lt;li&gt;fill 4 slots of the hopper inventory with &lt;b&gt;full&lt;/b&gt; stacks of dirt&lt;/li&gt;
	&lt;li&gt;fill the 5th slot in the hopper inventory with &lt;b&gt;half&lt;/b&gt; a stack of dirt&lt;/li&gt;
	&lt;li&gt;throw a &lt;b&gt;full&lt;/b&gt; stack of dirt into the hopper&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Observations after completing the steps above:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;the hopper will take in half of the stack of dirt that was thrown at it and the other half will bounce off &lt;em&gt;(expected behavior)&lt;/em&gt;&lt;/li&gt;
	&lt;li&gt;the restone signal originating from the comparator won&apos;t update although the hopper is now completely full &lt;em&gt;(bug)&lt;/em&gt;&lt;/li&gt;
	&lt;li&gt;a block update adjacent to the comparator will update the redstone signal to its proper strength&lt;/li&gt;
	&lt;li&gt;the item stacks in the hopper don&apos;t have to be all of the same type&lt;/li&gt;
	&lt;li&gt;the bug also occurs for example if 2 slots contain a 60 dirt stack (the other slots are full) and you throw a stack of at least 9 dirt in the hopper&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Pseudo code that illustrates the conditions that have to be met for this bug to occur:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;(space for items of type A in the hopper) &amp;lt; (stackSize of type A items thrown in the hopper)&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="24762">MC-10786</key>
            <summary>Comparator doesn&apos;t update when a hopper takes in only part of an item stack</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="-1">Unassigned</assignee>
                                    <reporter username="metzelm&#252;tze">Iprefer Anonymity</reporter>
                        <labels>
                            <label>redstone</label>
                    </labels>
                <created>Sat, 2 Mar 2013 17:00:38 +0100</created>
                <updated>Sun, 3 May 2015 06:17:09 +0200</updated>
                            <resolved>Mon, 4 Mar 2013 16:57:38 +0100</resolved>
                                    <version>Snapshot 13w09b</version>
                    <version>Snapshot 13w09c</version>
                                    <fixVersion>Snapshot 13w10a</fixVersion>
                                                        <votes>1</votes>
                                    <watches>1</watches>
                                                                            <comments>
                            <comment id="49096" author="wumpacraft" created="Sat, 2 Mar 2013 17:06:11 +0100"  >&lt;p&gt;It&apos;s true!&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="23092" name="1.png" size="467556" author="metzelm&#252;tze" created="Sat, 2 Mar 2013 17:00:39 +0100"/>
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                            <attachment id="23094" name="3.png" size="1097377" author="metzelm&#252;tze" created="Sat, 2 Mar 2013 17:00:39 +0100"/>
                            <attachment id="23095" name="4.png" size="1052651" author="metzelm&#252;tze" created="Sat, 2 Mar 2013 17:00:39 +0100"/>
                            <attachment id="23096" name="5.png" size="284187" author="metzelm&#252;tze" created="Sat, 2 Mar 2013 17:00:39 +0100"/>
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