I am encountering all sorts of random crashes as specified in other bug reports including the rollback issue, but the one reproducible crash I have found is when I go to take a particular map from a chest that is in a stronghold library. It crashes every time. So maybe look at the code that keeps track of maps?
MCPE-22448
Crash when I take a map from a chest in a stronghold library
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Crashes such as these are now logged automatically, so will be investigated further by the development team internally.
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