[MC-263974] Monsters are still generated in structures even if "spawn-monsters" is disabled

The bug

When spawn-monsters is set to false in server.properties, monsters are still generated as part of structures.

How to reproduce

Set up a server
Set spawn-monsters to false in server.properties
Open the server and find an ocean ruin
```
/locate structure ocean_ruin
```
→ ❌ Some drowned will have been generated around the ruin

Linked issues

is duplicated by 2

MC-274774 drowned zombie spawn even if monsters are disabled in server Resolved

MC-296298 drowned zombies with trident are spawning in ocean even if monster spawning is disabled in server Resolved

relates to 1

MC-278922 Creakings can spawn even if monsters are disabled in the server's properties Open

Comments 4

user-f2760 2023-07-01T19:58:05Z

What underwater monsters?
Spawners are not exactly a bug, as it prevents natural spawning, not all kinds of spawning.

That spawn-animals and spawn-npcs prevent existence in general is MC-379.

j_p_smith 2023-09-03T13:09:57Z

I've removed the part about spawners since you already reported it in MC-168581. As for the monsters spawning underwater, I was able to reproduce this since spawn-monsters doesn't affect the generation of drowned in ocean ruin structures, similar to MC-118347.

user-f2760 2023-09-03T13:12:41Z

Actually drowned spawning from ruins is included in their structure files, it's like a vindicator in a woodland mansion. It's not natural spawning/chunk generation in the same sense as animals spawning on world generation.

Ján Kinčeš 2023-11-15T17:50:08Z

i just today was swimming in water or ocean and underwater zombies spawned