Hostile Mobs not Spawning

All hostile mob spawning has halted as though the realm is set to Peaceful, but I've confirmed that it is still set to Easy.

What I expected to happen was...:
Mobs would spawn in very low light conditions

What actually happened was...:
No mobs spawn anywhere, even in total darkness

Steps to Reproduce:
1. Go to anywhere sufficiently dark for hostile mobs to span in 1.18
2. Wait for something top spawn
3. Nothing does