We've identified an issue in the current Minecraft Beta and Preview version that causes chunks to become corrupted below Y=0. To avoid corrupted chunks, please refrain from opening your worlds until an update has been released. - jhp
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The migration is having issues, would be nice to have a customer support to contact about it.
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Replying to @IamDovikin
Can you send us a screenshot of the error you're seeing? Be sure to remove any personal info such as your email address. ^NS

Apr 13, 2022 · 5:49 PM UTC

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Replying to @MojangSupport
I could get a screenshot I think
Replying to @MojangSupport
there is the one before i click install
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