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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-18156] Multiple biomes appear in worlds made before 0.17.0.1</title>
                <link>https://bugs.mojang.com/browse/MCPE-18156</link>
                <project id="10200" key="MCPE">Minecraft (Bedrock codebase)</project>
                    <description>&lt;p&gt;When opening a world I have created prior to the 0.17.0 beta, it changes the biomes of the whole world to random so ice and snow appear randomly while in other places snow melts and it looks like a checker board.&lt;/p&gt;</description>
            <key id="154129">MCPE-18156</key>
            <summary>Multiple biomes appear in worlds made before 0.17.0.1</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="1">Fixed</resolution>
                                            <reporter username="AMAN4700">AMAN4700</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 Nov 2016 22:24:58 +0100</created>
                <updated>Thu, 12 Jan 2017 20:08:25 +0100</updated>
                            <resolved>Sun, 20 Nov 2016 22:39:23 +0100</resolved>
                                    <version>0.17.0.1</version>
                                    <fixVersion>0.17.0.2</fixVersion>
                                                        <votes>8</votes>
                                    <watches>6</watches>
                                                                            <comments>
                            <comment id="345174" author="mector" created="Sun, 20 Nov 2016 22:28:20 +0100"  >&lt;p&gt;Appears to be fixxed in 17.0.2.  I had to reload a backup of my world for it to work.  Backup opened with out the checker board biomes.&lt;/p&gt;</comment>
                            <comment id="343746" author="mector" created="Wed, 16 Nov 2016 22:01:48 +0100"  >&lt;p&gt;Confirmed on tab pro.&lt;/p&gt;

&lt;p&gt;new chunks visited after 0.17 do not seem affected.  just chunks generated before 0.17.  Or so i have found.&lt;/p&gt;</comment>
                            <comment id="343301" author="plethora777" created="Wed, 16 Nov 2016 16:55:44 +0100"  >&lt;p&gt;I wrote &lt;a href=&quot;https://github.com/Plethora777/mcpe_viz&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mcpe_viz&lt;/a&gt;.  While working on updating it to support the cubic chunks in 0.17, I discovered what looks like a nasty problem with respect to saving per-chunk biome and grass color.  I believe this problem is the reason for this and related bugs.&lt;/p&gt;

&lt;p&gt;The new LevelDB record 0x2d appears to store the following data for each column in each chunk:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The height of the top block as a 2-byte integer&lt;/li&gt;
	&lt;li&gt;The Biome (1-byte) and Grass Color (3-byte)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The 0x2d record currently has a length of 768 bytes.  The &quot;height&quot; data consumes (16x16x2) 512 bytes.  The Biome + Grass Color &lt;em&gt;should&lt;/em&gt; consume (16x16x4) 1024 bytes.  &lt;b&gt;However, it appears that the 0x2f record currently only stores the first 4 rows of Biome + Grass Color (256 bytes).&lt;/b&gt;&lt;/p&gt;</comment>
                            <comment id="342147" author="deltafx" created="Sun, 13 Nov 2016 11:02:46 +0100"  >&lt;p&gt;Confirmed on Samsung J7 2016.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="154213">MCPE-18212</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="154242">MCPE-18232</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="154338">MCPE-18289</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="156860">MCPE-18831</issuekey>
        </issuelink>
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                            <issuelinktype id="10103">
                    <name>Relates</name>
                                                                <inwardlinks description="relates to">
                                        <issuelink>
            <issuekey id="154204">MCPE-18206</issuekey>
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            <issuelink>
            <issuekey id="154309">MCPE-18273</issuekey>
        </issuelink>
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                            <attachment id="128287" name="Biome.jpg" size="222193" author="Mega_Spud" created="Sat, 12 Nov 2016 20:25:02 +0100"/>
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