[MC-301593] Monsters can spawn from spawners with the "spawnMonsters" gamerule set to false

Monsters are able to spawn from Monster Spawners and Trial Spawners when this game rule is set to false.

This is different from how the old “spawnMonsters” server.properties setting worked, which would disable monsters from spawning from spawner blocks.

A good fix would perhaps be a new game rule: spawnerBlocksEnabled (similarly to commandBlocksEnabled), or even doMobSpawningFromSpawners.

Relates to MC-266487

Comments 2

bewketu bellar 2025-08-28T13:37:31Z

Probably intentional, judging from how MC-266487 is open

flamesatgames 2025-08-28T14:16:03Z

@bewketu bellar

Do note that there is a distinction between “Open” and “Working as Intended”.

Since the spawnMonsters game rule works different from the spawnMonsters server property, and that this wasn’t disclosed in the snapshot, I think it is fair to assume it is a bug.