[MCPE-186631] Biomes on older worlds get corrupted when upgrading to the latest versions

Biomes on older worlds such as those worlds created in version 1.8.0 are corrupted in 1.21.40.21 preview (and further versions) with no experimental features turned on. For instance, my portions of my swamp biome turned into ocean biome.

Loaded biomes are corrupted once the world was reloaded.

Edit: The older backup of the world (1 week before 1.21.40.21) works well with version 1.21.30.25 preview.

Here's the link to the world (RAR file) in OneDrive: https://1drv.ms/u/s!As6yzl-_8s1DgaIoBgl2I8eYJpv8NQ?e=J3H1eV

Related issues

duplicates

MCPE-186928 Chunks in all dimensions have their biome replaced with an Ocean biome upon reloading in updated older worlds created prior to <1.17.40

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migrated 2024-09-17T09:39:43Z

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migrated 2024-09-17T09:39:43Z

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GoldenHelmet 2024-09-17T10:08:17Z

Please attach a copy of the affected world.

Arisa Bot 2024-10-18T05:10:43Z

Thank you for your report!
We're resolving and linking this ticket forward as a duplicate of MCPE-186928, as that ticket contains more detailed information and/or has already been triaged by Mojang.

If you would like to add a vote and any extra information to the main ticket it would be appreciated.

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