The structure was generated in 1.15.2. Guardians, iron golem, and bats will still spawn but the other hostile mobs will not spawn within the area of the ocean monument even though there are valid spawning spaces.
Comments 3
I only opened the world in the official releases. I did look at the minecraft wiki on gamepedia.com and it says that this behavior is a feature, not a bug
Hi there!
Have you opened this world in any of the snapshots? If so, which one(s)?