Ocean ruin sometimes spawn way too many drowned

The bug

Sometimes, the ocean ruins can spawn up to 25 or more drowned. This seems most likely not intended as this example, only spawns one ruin structure and doesn't need 25 drowned to protect it.

How to reproduce

Seed: 33
Coordinates: /tp @s -1441.20 59.26 1121.90 39.81 82.31