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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-13608] Redstone components update when world is reloaded</title>
                <link>https://bugs.mojang.com/browse/MCPE-13608</link>
                <project id="10200" key="MCPE">Minecraft (Bedrock codebase)</project>
                    <description>&lt;p&gt;In my survival world, I have a lever that controls dispensers on a semi automatic wheat farm.  The dispensers fire water buckets.  I Have a circuit seen below which activates on the rising and falling action of the lever.  When I am in the game, the circuit works as intended but if I relog the game (quit to title and join back) the dispenser will fire the bucket and stay in that state.  I assume it is the Redstone torches that do not save state as I leave the game.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;From &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-14233&quot; title=&quot;Redstone components update upon reloading a world&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-14233&quot;&gt;&lt;del&gt;MCPE-14233&lt;/del&gt;&lt;/a&gt;:&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Upon loading a world, redstone components update. The redstone may change based on an unloaded chunk, causing it to turn off when it should be being powered by something in the unloaded chunk next to it. To reproduce: make a long line of redstone with repeaters, power one end, then stand at the other end and lower your render distance. Then reload the world. The redstone will turn off, then turn back on as you load the component powering it. This affects all redstone components that I am aware of, including pistons. It tends to break contraptions as one half may update while the other is unloaded, often sending redstone contraptions into a clock.&lt;/p&gt;

&lt;p&gt;Steps to reproduce:&lt;br/&gt;
1. Create a flat creative world.&lt;br/&gt;
2. Place a lever, turn it &lt;b&gt;on&lt;/b&gt;, and then place a long line redstone dust and repeaters extending far out some distance outside of chunk-loading range, and then make the wire do a u-turn and come back to the start. Make sure there are repeaters so that the signal can go all the way.&lt;br/&gt;
3. Exit the world and reload it.&lt;br/&gt;
4. Wait a little while, and you&apos;ll notice that the returning end of the wire will turn off, as the redstone updates and can&apos;t find a power source, since the connection between the start and end is unloaded, and also because of &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-15779&quot; title=&quot;Redstone does not load chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-15779&quot;&gt;&lt;del&gt;MCPE-15779&lt;/del&gt;&lt;/a&gt;. (Though even if that was fixed there might still be a moment where the dust becomes unpowered while the chunks are still being loaded.)&lt;/p&gt;

&lt;p&gt;This effect can also sometimes be seen in cases where a piston is being powered by a source in another chunk, and the chunk with the piston loads first. This is more difficult to reproduce in a world, though.&lt;/p&gt;

&lt;hr /&gt;
&lt;p&gt;&lt;b&gt;Edit by&lt;/b&gt; &lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=depressed-pho&quot; class=&quot;user-hover&quot; rel=&quot;depressed-pho&quot;&gt;depressed-pho&lt;/a&gt;:&lt;br/&gt;
The second part of the original description is WAI: &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-15779&quot; title=&quot;Redstone does not load chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-15779&quot;&gt;&lt;del&gt;MCPE-15779&lt;/del&gt;&lt;/a&gt;.&lt;br/&gt;
The first part, redstone components being ticked upon loading chunks, is the real issue. It is probably a leftover from the past behavior: state of redstone components used to be forgotten upon unloading chunks, and in order to recover it the game ticked all of them on the chunk reload. Now their state seems to be correctly saved in the file so they need not to be ticked, and doing so also causes the very problem: components in unloaded chunks affect the entire contraption. To reproduce this,&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Open a world attached to &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-15779&quot; title=&quot;Redstone does not load chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-15779&quot;&gt;&lt;del&gt;MCPE-15779&lt;/del&gt;&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;Load all the chunks where the entire circuit resides in.&lt;/li&gt;
	&lt;li&gt;Return to the point where the piston is placed.&lt;/li&gt;
	&lt;li&gt;Close the world and open it again.&lt;/li&gt;
	&lt;li&gt;Observe that the piston momentarily extends and then retracts. Ideally the piston and the line of dust should stay activated even though the middle part of the dust line is in unloaded chunks, because their last state (active) should be saved in the file and the game only needs to restore it.&lt;/li&gt;
&lt;/ol&gt;
</description>
            <key id="134789">MCPE-13608</key>
            <summary>Redstone components update when world is reloaded</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="thejman">Jim</reporter>
                        <labels>
                            <label>redstone</label>
                            <label>world-loading</label>
                    </labels>
                <created>Thu, 18 Feb 2016 00:31:26 +0100</created>
                <updated>Fri, 8 Mar 2024 13:59:30 +0100</updated>
                            <resolved>Sun, 4 Jun 2017 05:31:02 +0200</resolved>
                                    <version>0.14.0</version>
                    <version>0.14.0 Beta 7</version>
                    <version>0.14.2</version>
                    <version>0.15.6</version>
                    <version>0.16.0</version>
                    <version>0.16.1</version>
                    <version>0.17.0.1</version>
                    <version>0.16.2</version>
                    <version>1.0.0.0</version>
                    <version>1.0.0.1</version>
                    <version>1.0.2</version>
                    <version>1.0.3</version>
                    <version>1.0.4.0</version>
                    <version>1.0.4.1</version>
                    <version>1.0.4.11</version>
                    <version>1.0.5.13</version>
                    <version>1.0.6.0</version>
                    <version>1.0.5.54</version>
                    <version>1.1.0.0</version>
                    <version>1.0.7.0</version>
                    <version>1.1.0.8</version>
                    <version>1.1.0.9</version>
                                    <fixVersion>1.1.0.55</fixVersion>
                                                        <votes>9</votes>
                                    <watches>9</watches>
                                                                            <comments>
                            <comment id="386556" author="depressed-pho" created="Sun, 4 Jun 2017 05:31:02 +0200"  >&lt;p&gt;Fixed in 1.1.0.55! Yay!&lt;/p&gt;</comment>
                            <comment id="333961" author="zebulanstanphill@gmail.com" created="Fri, 7 Oct 2016 23:47:49 +0200"  >&lt;p&gt;&lt;del&gt;Affects 0.15.90.8 (0.16.0 beta build 5). Interestingly, I&apos;ve only had this happen to me on Pocket Edition, and it isn&apos;t happening to me on Win10 0.15.10. I may need to do some more testing, though.&lt;/del&gt;&lt;/p&gt;

&lt;p&gt;Ignore this comment, I believe I was improperly testing this bug. I&apos;ll try and properly test it later...&lt;/p&gt;</comment>
                            <comment id="324751" author="thejman" created="Wed, 10 Aug 2016 23:11:07 +0200"  >&lt;p&gt;Yes, Azelef is right this still is a major problem. I mistakenly typed 0.15.2 insteard of 0.15.4&lt;/p&gt;

&lt;p&gt;I have noticed in my testing that this happens with redstone blocks with a torch on top as well.&lt;/p&gt;</comment>
                            <comment id="324668" author="azelef" created="Wed, 10 Aug 2016 18:50:10 +0200"  >&lt;p&gt;Confirmed in 0.15.4, please reopen.&lt;/p&gt;</comment>
                            <comment id="324274" author="aman4700" created="Mon, 8 Aug 2016 16:50:18 +0200"  >&lt;p&gt;I&apos;m sorry sir, 0.15.4 is the current version, not 0.15.2.&lt;/p&gt;</comment>
                            <comment id="324147" author="thejman" created="Mon, 8 Aug 2016 04:39:22 +0200"  >&lt;p&gt;Still happens in 0.15.2&lt;/p&gt;

&lt;p&gt;I tried in a different world and this happened as well.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Jim&lt;/p&gt;</comment>
                            <comment id="323864" author="aman4700" created="Mon, 8 Aug 2016 03:49:29 +0200"  >&lt;p&gt;Please respond and add the current version if you can reproduce this issue.&lt;/p&gt;</comment>
                            <comment id="304882" author="jjewett27" created="Sun, 15 May 2016 22:46:14 +0200"  >&lt;p&gt;Yes this bug is still around in 0.14.2 for my iPhone 4- I have tested numerous combinations of redstone, torches, repeaters, comparators and dispensers. Most times there is a single pulse right as the world opens that activates the dispenser. My guess is that the powered state of the dispenser is not saved so when you open the world it activates it again. Please fix. This causes damage when you have TNT dispensers.&lt;/p&gt;</comment>
                            <comment id="290554" author="jimcreeperhunter" created="Mon, 29 Feb 2016 01:07:42 +0100"  >&lt;p&gt;Yes, unfortunately this still occurs same as before.&lt;/p&gt;</comment>
                            <comment id="290496" author="aman4700" created="Sun, 28 Feb 2016 21:26:38 +0100"  >&lt;p&gt;Does this bug still appear in 0.14.0? If so please respond.&lt;/p&gt;</comment>
                            <comment id="287113" author="depressed-pho" created="Thu, 18 Feb 2016 06:01:29 +0100"  >&lt;p&gt;Never mind, that happens often.&lt;/p&gt;

&lt;p&gt;Btw this &lt;b&gt;&quot;Relates to&quot;&lt;/b&gt; &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-13270&quot; title=&quot;Comparators measuring a non-empty container momentarily stop emitting power upon reloading&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-13270&quot;&gt;&lt;del&gt;MCPE-13270&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-13413&quot; title=&quot;Active unpowered locked repeaters become inactive after reloading&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-13413&quot;&gt;&lt;del&gt;MCPE-13413&lt;/del&gt;&lt;/a&gt; but it is possible that they are all the same bug.&lt;/p&gt;</comment>
                            <comment id="287069" author="thejman" created="Thu, 18 Feb 2016 00:47:16 +0100"  >&lt;p&gt;I apoligise I uploaded this 3 Times as my phone does not seem to be giving me confirmation of a successful post.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="134790">MCPE-13609</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="139860">MCPE-14233</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10103">
                    <name>Relates</name>
                                            <outwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="188308">MCPE-29548</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="133683">MCPE-13270</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="134002">MCPE-13413</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="144418">MCPE-15779</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="151829">MCPE-17464</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="155922">MCPE-18570</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="552168">MCPE-179412</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="164296">MCPE-20159</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="132696" name="MCPE-15779.zip" size="106616" author="nighter" created="Tue, 24 Jan 2017 14:59:13 +0100"/>
                            <attachment id="111348" name="Screenshot_2016-02-17-18-24-51.png" size="1573143" author="thejman" created="Thu, 18 Feb 2016 00:31:26 +0100"/>
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