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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Unfortunately it sounds like your world data may be corrupted. We're not able to assist with fixing corrupt save data, but if you contact us at msft.it/6017wSuOb, we can at least give you a bit more information about what to do next. ^NS
Mar 31, 2022 · 2:38 PM UTC