In any sort of world type where the sea level is lower than normal, ocean monuments will generate water above sea level. This was once fixed as of MC-57691, but it came back.
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Can confirm this for 20w51a, but I think this is WAI/Won't Fix since the water is necessary part of the structure.

Can confirm in 21w13a. It only really needs water on the inside, so that terrain can't appear there, and the outside can be filled with structure voids.
Can confirm.