The only I know to replicate this issue is to play on a world for some time, save and quit, and then there is a chance for the game to crash.
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Thank you for your report!
However, this issue is a Duplicate of MCPE-21416.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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I too has this bug π
But this is 50%/50% will be crash mcpe or no