This bug only affects flat (grass) worlds. When the game lags out for whatever reason, there is a chance that a natural generated world will spawn. Although your builds will not be deleted, the world will surround the builds, creating a CHUNKY world. Just ... furstrating
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-11144.
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Btw, those are all my redstone testing worlds! Pls just fix this