I was exploring newly loaded chunks and found this ocean monument that spawned slightly underground. This world was created in an older snapshot and was updated to 21w43a. The biome it is in is considered an ocean biome.
MCL-19947
Ocean monument spawning underground
Resolved
Duplicate
0
migrated
(Unassigned)
Unconfirmed
world, world-generation
Retrieved
Does MC-239870 describe your issue?