In any dimensions, in any difficulty no hostile mobs (as well as endermen) won't spawn naturally (if spawn with commands, spawn eggs or golem-like they will stay and act normaly as expected), only the Ender Dragon does. In caves, at night, in the Nether, End, zero hostile mobs (even with structure spawning, such as pillager outpost, none will spawn.

Even by going in survival, explore, change biomes, I didn't see a single hostile mob.

How to reproduce: Play the game in the 25w02a snapshot, explore and see for yourself