On world upgraded from 1.17 to 21w44a, I found an igloo generated in the middle of the ocean.
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Duplicates MC-214795
Did this occour on the border where new and old chunks are "blended"? If so it might be an issue with the blending mechanic.

This occurred far from old chunks, when I generated a new world with this seed the terrain looked the same but there was no igloo nor village. Uploading picture from the newly generated world for comparison.
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When generated in the old version both village and igloo are in the same location.
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