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    <title>Mojang Studios Jira</title>
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    <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-15862] Rail Duplication Bug</title>
                <link>https://bugs.mojang.com/browse/MCPE-15862</link>
                <project id="10200" key="MCPE">Minecraft (Bedrock codebase)</project>
                    <description>&lt;p&gt;Rails can be duplicated when they are pushed downwards (or sideways) by a piston.&lt;/p&gt;

&lt;p&gt;In the setup pictured, when the rail on a block is pushed downwards by the top piston and block, the rail is remains placed on the lower block, but also drops an extra rail, allowing it to be infinitely duplicated.&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;120881_thumb&quot; href=&quot;https://bugs.mojang.com/secure/attachment/120881/120881_raildup.jpg&quot; title=&quot;raildup.jpg&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;120881&quot; file-preview-title=&quot;raildup.jpg&quot;&gt;&lt;img src=&quot;https://bugs.mojang.com/secure/thumbnail/120881/_thumb_120881.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;Also affects other types of rail also, though these break when pushed back up.&lt;/p&gt;

&lt;p&gt;This issue was brought to my attention by means of this video: &lt;a href=&quot;https://youtu.be/J0OeQ--oSxU&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://youtu.be/J0OeQ--oSxU&lt;/a&gt;&lt;/p&gt;</description>
            <key id="145263">MCPE-15862</key>
            <summary>Rail Duplication Bug</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="Mega_Spud">[Mojang] Mega_Spud (Jay Wells)</reporter>
                        <labels>
                    </labels>
                <created>Sat, 25 Jun 2016 11:28:54 +0200</created>
                <updated>Wed, 20 Jul 2016 20:51:08 +0200</updated>
                            <resolved>Wed, 20 Jul 2016 11:11:11 +0200</resolved>
                                    <version>0.15.0</version>
                    <version>0.15.1</version>
                    <version>0.15.2</version>
                                    <fixVersion>0.15.3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                            <comments>
                            <comment id="320112" author="mega_spud" created="Fri, 8 Jul 2016 23:16:39 +0200"  >&lt;p&gt;As seen in the setup pictured here, the duplication of the rail can be reliably reproduced in great quantities.&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;121619_thumb&quot; href=&quot;https://bugs.mojang.com/secure/attachment/121619/121619_raildupe.png&quot; title=&quot;raildupe.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;121619&quot; file-preview-title=&quot;raildupe.png&quot;&gt;&lt;img src=&quot;https://bugs.mojang.com/secure/thumbnail/121619/_thumb_121619.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;</comment>
                            <comment id="320049" author="rplatham" created="Fri, 8 Jul 2016 15:29:36 +0200"  >&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=PikaBlu&quot; class=&quot;user-hover&quot; rel=&quot;PikaBlu&quot;&gt;PikaBlu&lt;/a&gt; Try the configurations shown in &lt;a href=&quot;https://bugs.mojang.com/browse/MCPE-16093&quot; title=&quot;MCPE Crashes frequently when a minecart that is activating a detector rail and that dector rail are pushed by pistons at the same time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MCPE-16093&quot;&gt;&lt;del&gt;MCPE-16093&lt;/del&gt;&lt;/a&gt; without the minecart (which causes the crash). &lt;/p&gt;</comment>
                            <comment id="320048" author="pikablu" created="Fri, 8 Jul 2016 15:27:49 +0200"  >&lt;p&gt;After half an hour of experimenting i have created a fully automatic rail farm, but like i said before its extremely rare for the dupe to occour but it is AFK friendly making it still be classed as a dupe farm. now this has become a problem. Unless you need rails... &lt;/p&gt;</comment>
                            <comment id="320046" author="pikablu" created="Fri, 8 Jul 2016 15:08:30 +0200"  >&lt;p&gt;After an hour of testing this i have concluded it dose happen but its extremely rare for it to work and currently i have found no possible way to automate it reliably like the video cliams. So my cunclusion is its not a real dupe bug because it works once every ~30 tries for me and its impossible to automate. I will continue testing later and see if it can be made 100% reliable or automatable making it a real dupe glitch and then actually making it a problem.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="145983">MCPE-16064</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="146796">MCPE-16301</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="120881" name="raildup.jpg" size="156943" author="Mega_Spud" created="Sat, 25 Jun 2016 11:28:54 +0200"/>
                            <attachment id="121619" name="raildupe.png" size="1455779" author="Mega_Spud" created="Fri, 8 Jul 2016 23:16:39 +0200"/>
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