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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-8826] Adding an item to a hopper with a dropper does not change comparator state.</title>
                <link>https://bugs.mojang.com/browse/MC-8826</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;I found this when testing snapshot 13w05a in my redstone world.&lt;br/&gt;
I had built a few devices using a dropper/hopper based randomizer in the 13w04a snapshot, and they all worked as expected. After installing 13w05a I found none of them worked.&lt;/p&gt;

&lt;p&gt;When an item is placed into a hopper by a dropper, the hopper does not change the state of any comparator attached to it.&lt;/p&gt;

&lt;p&gt;Process:&lt;br/&gt;
1. Place a dropper anywhere.&lt;br/&gt;
2. Place a hopper facing the output side of the dropper.&lt;br/&gt;
3. Place a comparator for redstone output of the hopper.&lt;br/&gt;
4. Put any item of any amount in the dropper.&lt;br/&gt;
5. Power the dropper. A button works well for this example.&lt;/p&gt;

&lt;p&gt;Expected result:&lt;br/&gt;
The dropper puts one item in the hopper.&lt;br/&gt;
The comparator would activate and stay on for as long as the item remains in the hopper.&lt;br/&gt;
The hopper puts the item back in the dropper.&lt;/p&gt;

&lt;p&gt;Observed result:&lt;br/&gt;
The comparator did not activate.&lt;br/&gt;
The comparator becomes a BUD, activating by any block update around it, provided the hopper still holds items.&lt;/p&gt;</description>
                <environment>Mac OS 10.7.4</environment>
        <key id="22083">MC-8826</key>
            <summary>Adding an item to a hopper with a dropper does not change comparator state.</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="jeb">[Mojang] Jeb (Jens Bergensten)</assignee>
                                    <reporter username="steve104">Steven E</reporter>
                        <labels>
                            <label>dropper</label>
                            <label>hopper</label>
                            <label>redstone-comparator</label>
                    </labels>
                <created>Thu, 31 Jan 2013 20:48:16 +0100</created>
                <updated>Mon, 27 Mar 2017 21:27:03 +0200</updated>
                            <resolved>Mon, 4 Mar 2013 09:56:28 +0100</resolved>
                                    <version>Snapshot 13w05a</version>
                    <version>Snapshot 13w06a</version>
                    <version>Snapshot 13w07a</version>
                    <version>Snapshot 13w09a</version>
                    <version>Snapshot 13w09b</version>
                    <version>Snapshot 13w09c</version>
                                    <fixVersion>Snapshot 13w10a</fixVersion>
                                                        <votes>9</votes>
                                    <watches>1</watches>
                                                                            <comments>
                            <comment id="47784" author="chartreuse" created="Tue, 26 Feb 2013 21:05:24 +0100"  >&lt;p&gt;Just tested this out in 13w09a and the bug still exists in it&apos;s reported form, even though the general comparators not getting updated by Hoppers bug (&lt;a href=&quot;https://bugs.mojang.com/browse/MC-9687&quot; title=&quot;Hopper don&amp;#39;t update comparator when receiving item stack&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-9687&quot;&gt;&lt;del&gt;MC-9687&lt;/del&gt;&lt;/a&gt;) has been fixed.&lt;/p&gt;</comment>
                            <comment id="45228" author="mikemcdonald83" created="Mon, 11 Feb 2013 10:33:36 +0100"  >&lt;p&gt;This also bugs out for Dropper-to-Dropper updates with the comparator. I was making a counter, and the comparator should have lit up when one dropper is filled up by another. This doesn&apos;t happen unless I update a block next to the comparator connected to the receiving dropper. I know my wiring is correct because all I have to do is update a block or replace the comparator and all works as intended. This was the case in both 13w05a and 13w06a in SSP. Thanks.&lt;/p&gt;</comment>
                            <comment id="44396" author="fibonatic" created="Fri, 8 Feb 2013 00:15:53 +0100"  >&lt;p&gt;The strange this is that this bug only occurs when a dropper puts an item into a hopper. A comparator does update its output if another hopper would transfer an item into the hopper (throwing an item into the hopper would trigger it as well). And replacing the hopper by any other block (or entity) with an inventory (chest, furnace, dropper, dispenser, hopper, minecart with chest/hopper) does update the comparator when a dropper would drop an item into it.&lt;/p&gt;</comment>
                            <comment id="44253" author="steve104" created="Thu, 7 Feb 2013 18:48:04 +0100"  >&lt;p&gt;Not a duplicate. Tested in 13w06a, and it still exists as reported, even though MC 8776 and duplicates have been fixed.&lt;/p&gt;</comment>
                            <comment id="41926" author="zzcc90" created="Thu, 31 Jan 2013 21:27:59 +0100"  >&lt;p&gt;Duplicate of &lt;a href=&quot;https://bugs.mojang.com/browse/MC-8776&quot; title=&quot;Comparators do not update their output signal&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-8776&quot;&gt;&lt;del&gt;MC-8776&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="41922" author="steve104" created="Thu, 31 Jan 2013 21:07:15 +0100"  >&lt;p&gt;Thanks for the quick confirmation. I was really disappointed by this one. Looking forward to a fix soon. &lt;/p&gt;</comment>
                            <comment id="41918" author="bljat" created="Thu, 31 Jan 2013 21:03:14 +0100"  >&lt;p&gt;Confirmed.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="22726">MC-9182</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="23371">MC-9652</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="23562">MC-9815</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="23842">MC-10009</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="24862">MC-10881</issuekey>
        </issuelink>
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