A structure made of of slabs a walk way has dupelicated its self destoryed terrain and ploped its alternate self down 20+ bocks from its previous position, and it has destroyed a large chunk of a mountain
that is all
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What actually happened was...:
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Probably a duplicate of MC-81488. Did this movement happen after exiting and reopening the world? Also, you might want to make a backup of your worlds onto another drive.