Multiple,chunks at a time have disappeared, bedrock and all. The biggest problem is not being able to explore for fear of stumbling across a large area of void.
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Thank you for your report!
We're tracking this issue under MCPE-58514 so I've requested this report be resolved and linked as a duplicate.
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 also found this bug, when i loaded too much mobs my game crashed and then it happend