Every time I try to duplicate a saved game it is corrupt, so I cannot create a backup of my saved game. The original save game is not corrupt, I can play it fine, however the bug occurs every time I try to save a copy and it is not intermittent.
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In that report, the OP states that: “In some very few cases the game kicked me out of the world instantly when loading such a corrupted duplicated world, showing me a message telling me: ‘disconnected due to world corruption’“
So it appears that the underlying issue is the same, just you may get a different world corruption message depending on unknown factors.
Duplicates MCPE-221365