When I opened up my world, there was an error in the chunks. The chunks are scattered throughout the place in the wrong places. For example, what was originally my house would now be separated in multiple pieces and scattered throughout the world, the terrain is also messed up, a chunk of a mountain or reef would be missing and replaced with something else. The chunks are not in their rightful places.
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Duplicate of MC-161823
I have the same issue. Hope they don't ignore your post.