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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We apologize for the inconvenience, as this is currently a known issue. The team is currently working on a fix that should help with the issue as soon as possible. Thank you for your patience while we work on the solution! ^FF
Apr 22, 2022 · 9:50 PM UTC

