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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-12848] Comparators measuring a container take redstone 2 ticks to change their state instead of 1</title>
                <link>https://bugs.mojang.com/browse/MCPE-12848</link>
                <project id="10200" key="MCPE">Minecraft (Bedrock codebase)</project>
                    <description>&lt;p&gt;Comparators send their signal too slowly when activated.  This causes a problem with unloaders because the powered rail doesn&apos;t deactivate in time to stop the minecart chest over the hopper. Usually the minecart bounces off the block and returns back along the track. The hopper is only has time to disgorge one item from the cart per run.&lt;/p&gt;

&lt;p&gt;I&apos;ve tried a couple of designs and both have the same issue.&lt;/p&gt;</description>
            <key id="132752">MCPE-12848</key>
            <summary>Comparators measuring a container take redstone 2 ticks to change their state instead of 1</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="6">Works As Intended</resolution>
                                            <reporter username="skribe">skribe</reporter>
                        <labels>
                            <label>redstone</label>
                            <label>redstone-comparator</label>
                            <label>redstone-timing</label>
                    </labels>
                <created>Sat, 30 Jan 2016 05:15:37 +0100</created>
                <updated>Sun, 2 Dec 2018 19:00:27 +0100</updated>
                            <resolved>Wed, 19 Jul 2017 19:50:32 +0200</resolved>
                                    <version>0.14.0 Beta 2</version>
                    <version>0.14.0 Beta 3</version>
                    <version>0.14.2</version>
                    <version>0.14.3</version>
                    <version>0.15.0</version>
                    <version>0.15.2</version>
                    <version>0.15.6</version>
                    <version>0.15.90.7</version>
                    <version>0.15.9</version>
                    <version>0.16.1</version>
                    <version>0.16.2</version>
                                                                        <votes>11</votes>
                                    <watches>9</watches>
                                                                            <comments>
                            <comment id="504643" author="scott mc" created="Sun, 2 Dec 2018 19:00:27 +0100"  >&lt;p&gt;Quick list of the possible problems.&lt;/p&gt;

&lt;p&gt;Power rails are reativating too quickly.&lt;/p&gt;

&lt;p&gt;Items being taken from a minecart/hopper to another hopper are leaving the second hopper too quickly.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://youtu.be/gr4tlA9-430&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://youtu.be/gr4tlA9-430&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://youtu.be/t-cWqvP8rw0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://youtu.be/t-cWqvP8rw0&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;These two designs no longer work in xb360.&lt;/p&gt;

&lt;p&gt;The mine cart drops one item and is sent back down the rail.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="394770" author="helenangel" created="Wed, 19 Jul 2017 19:50:32 +0200"  >&lt;p&gt;Devs reported back that this works as intended.&lt;br/&gt;
Explanation:&lt;br/&gt;
1 tick for updating the torch.&lt;br/&gt;
1 tick for updating the hoppers. (arguably this could take a tick longer)&lt;br/&gt;
1 tick for updating the comparator.&lt;/p&gt;</comment>
                            <comment id="374910" author="zebulanstanphill@gmail.com" created="Fri, 31 Mar 2017 07:36:27 +0200"  >&lt;p&gt;This may just be a duplicate of &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-15793&quot; title=&quot;Redstone components don&amp;#39;t apply the correct amount of delay when activated by world changes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-15793&quot;&gt;MCPE-15793&lt;/a&gt;... it&apos;s hard to tell. When 15793 is fixed, we&apos;ll know for sure.&lt;/p&gt;</comment>
                            <comment id="354430" author="handlbar.rick@comcast.net" created="Mon, 16 Jan 2017 01:51:03 +0100"  >&lt;p&gt;Appears to be fixed in 1.0 (Windows 10 at least).&lt;/p&gt;</comment>
                            <comment id="348819" author="depressed-pho" created="Fri, 16 Dec 2016 16:23:50 +0100"  >&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;130703_thumb&quot; href=&quot;https://bugs.mojang.com/secure/attachment/130703/130703_12848-2.jpg&quot; title=&quot;12848-2.jpg&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;130703&quot; file-preview-title=&quot;12848-2.jpg&quot;&gt;&lt;img src=&quot;https://bugs.mojang.com/secure/thumbnail/130703/_thumb_130703.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt;&lt;br/&gt;
OH WHAT THE&lt;/p&gt;

&lt;p&gt;...so this is very similar to &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-17208&quot; title=&quot;Repeaters set to 1-redstone-tick &amp;amp; comparators have no delay compared to redstone dust&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-17208&quot;&gt;&lt;del&gt;MCPE-17208&lt;/del&gt;&lt;/a&gt; / &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-17274&quot; title=&quot;Repeaters add random delay to pistons (but not to other components)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-17274&quot;&gt;&lt;del&gt;MCPE-17274&lt;/del&gt;&lt;/a&gt;...&lt;/p&gt;</comment>
                            <comment id="348782" author="talaeus" created="Fri, 16 Dec 2016 09:18:40 +0100"  >&lt;p&gt;We don&apos;t know what exactly is incorrect and in what way it is incorrect. PHO, in the last image you posted, you will get another result if you put a repeater between the lever and the rest of the machine. &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; (yes, that is another bug which I think is already reported) However, it looks to me that it&apos;s the dispenser that&apos;s too slow...&lt;/p&gt;</comment>
                            <comment id="332317" author="depressed-pho" created="Fri, 30 Sep 2016 06:22:16 +0200"  >&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;125393_thumb&quot; href=&quot;https://bugs.mojang.com/secure/attachment/125393/125393_comparator-is-the-culprit-not-hopper.jpg&quot; title=&quot;comparator-is-the-culprit-not-hopper.jpg&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;125393&quot; file-preview-title=&quot;comparator-is-the-culprit-not-hopper.jpg&quot;&gt;&lt;img src=&quot;https://bugs.mojang.com/secure/thumbnail/125393/_thumb_125393.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt;&lt;br/&gt;
The screenshot shown above proves that it&apos;s comparators that are doing the wrong thing, not hoppers.&lt;/p&gt;

&lt;p&gt;There is a single item in the dropper. Push the button to activate a dropper that is measured by a comparator. The dropper pushes the item into the hopper after 2 ticks (as expected). The comparator deactivates after 2 ticks (unexpectedly) instead of 1 tick.&lt;/p&gt;</comment>
                            <comment id="330453" author="nighter" created="Tue, 20 Sep 2016 15:46:08 +0200"  >&lt;p&gt;This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided). &lt;/p&gt;</comment>
                            <comment id="327075" author="zebulanstanphill@gmail.com" created="Sat, 27 Aug 2016 04:55:32 +0200"  >&lt;p&gt;Confirmed for 0.15.6. (Tested on Windows 10.)&lt;/p&gt;</comment>
                            <comment id="327026" author="lloydaz" created="Fri, 26 Aug 2016 21:32:46 +0200"  >&lt;p&gt;I am trying to build an item sorting system and the slow reaction of the comparator is causing the items to go past the filter and wind up in the junk chest.&lt;/p&gt;

&lt;p&gt;I am using a standard sorting construct with overflow protection.  Items come up an item elevator into a hopper line. &lt;/p&gt;</comment>
                            <comment id="298960" author="depressed-pho" created="Thu, 7 Apr 2016 15:56:44 +0200"  >&lt;p&gt;Still affects 0.14.1.&lt;/p&gt;</comment>
                            <comment id="292860" author="depressed-pho" created="Sun, 6 Mar 2016 03:12:23 +0100"  >&lt;p&gt;But &lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=skribe&quot; class=&quot;user-hover&quot; rel=&quot;skribe&quot;&gt;skribe&lt;/a&gt;, I think your unloader is not very reliable because even without the bug it would take 3 redstone ticks (6 game ticks) for the powered rail to deactivate after the minecart hits the block. I assume 6 game ticks is long enough for the minecart to bounce off.&lt;/p&gt;</comment>
                            <comment id="292259" author="depressed-pho" created="Fri, 4 Mar 2016 02:57:50 +0100"  >&lt;p&gt;Confirmed in 0.14.0 alpha / iOS.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Summary:&lt;/b&gt; Comparator delays 2 ticks instead of 1 while measuring a container&lt;/p&gt;

&lt;p&gt;In my screenshot below, the right side of two hoppers facing each other has 1 item. When the button is pushed, it should take 2 ticks for the comparator to change its state (1 tick for the torch, and 1 for the comp itself). But actually it takes 3 ticks as shown.&lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;113129_thumb&quot; href=&quot;https://bugs.mojang.com/secure/attachment/113129/113129_comparator-delays-2-ticks.png&quot; title=&quot;comparator-delays-2-ticks.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;113129&quot; file-preview-title=&quot;comparator-delays-2-ticks.png&quot;&gt;&lt;img src=&quot;https://bugs.mojang.com/secure/thumbnail/113129/_thumb_113129.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="133274">MCPE-13108</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10103">
                    <name>Relates</name>
                                                                <inwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="144472">MCPE-15793</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="132639">MCPE-12796</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="144071">MCPE-15607</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="130703" name="12848-2.jpg" size="158652" author="depressed-pho" created="Fri, 16 Dec 2016 16:23:50 +0100"/>
                            <attachment id="109542" name="2016-01-30 04.05.27.png" size="831550" author="skribe" created="Sat, 30 Jan 2016 05:15:37 +0100"/>
                            <attachment id="113129" name="comparator-delays-2-ticks.png" size="2194861" author="depressed-pho" created="Fri, 4 Mar 2016 02:57:50 +0100"/>
                            <attachment id="125393" name="comparator-is-the-culprit-not-hopper.jpg" size="258482" author="depressed-pho" created="Fri, 30 Sep 2016 06:22:16 +0200"/>
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