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
131
61
11
548
For assistance with Demo Mode, please check out: msft.it/6013wFkHc for help. ^FF
Apr 14, 2022 · 10:34 PM UTC

