In Peaceful difficulty, monster spawners still activate but do not spawn monsters in Bedrock Edition. In Java Edition, zombified piglins, magma cubes, and ghasts do not spawn at all and other hostile mobs disappear immediately after spawning.
In Peaceful difficulty, monster spawners still activate but do not spawn monsters in Bedrock Edition. In Java Edition, zombified piglins, magma cubes, and ghasts do not spawn at all and other hostile mobs disappear immediately after spawning.