Since the height limit was changed in 21w06a, the water world preset has sea level below height 62, making the ocean monuments appear above the sea and with a large area of water around it.
Relates to MC-214951
Linked issues
is cloned by 1
is duplicated by 2
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Comments 3

this also applies to the "caves" world type

I don't know if I should mark this as affected by 21w15a if it only happens when using the datapack that Mojang provided in the changelog. Does anybody know?
Relates to MC-214795 which covers the default world type