My world recently crashed. I have 4 worlds and 3/4 load perfectly fine. 1 of which has half of my progress saved while the other half is completely gone. The issue is not that it wasn't saved because its random things (a floor is missing, grounds previously destroyed are whole again, the building is missing the walls, etc.)
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MC-161823 partially looks like my issue.
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Does MC-161823 describe your issue?