[MCPE-98789] Chunks voided or reset to new generation

Note

This report covers any of the following occuring without a game crash:

Chunks (portions of the world) being wholly or partially (i.e. below a certain Y-level) deleted and turned to void/air
Chunks being reset to a state of initial generation (This may result in the chunk not matching surrounding chunks that were generated in an earlier version.)
Chunks reverting to an earlier saved state (usually the state the chunk was in before the last time that area of the world was visited)

Rollbacks related to crashes on realms are tracked at MCPE-12347.

This bug is reported in single-player worlds, more commonly in multiplayer, and most commonly on realms (similar to data loss involving entities, ~~MCPE-21416~~) or with syncing worlds through cloud saves (MCPE-26064).

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The chunks didn't load and when i was on the "worlds" and the world's picture was a purple and black checkered, I didn't think much about it but that's when I joined the world and I saw chunks broken up all over, like an earthquake just happened . Luckily I was working on it for a couple of days, so I didn't lose so much progress. It is just that I do not want this to happen again in my world.