While Minecraft was running with the world open, I needed to reset the computer so I powered it down and turned it back on. When I reopened my world, many chunks were reset and a few were deleted. There used to be an "L" shaped house, multiple beacons and some other things. Now, as you can see in the photo, only the chunk I spawned in is still there.
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Thank you for your report!
We're tracking this issue in MCPE-150757, so this ticket is being resolved and linked as a duplicate.
It would be helpful if you could upload a copy of the world to MCPE-150757.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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