Ocean Structures spawn on surface

I was exploring on my world and I saw this ocean loot thing. It was an Ocean structure.

Seed = -6667898273586183147

Version = 1.15.2

I couldn't find the right version. Sorry.

Steps to Reproduce = Create a new world with the seed -6667898273586183147 and go to

XYZ = -1276.332 / 65.00000 / 261.385