Mobs both passive and enemy are not spawning in loaded chunks when below Y= 29. I was trying to map out Slime chunks when the new update was pushed today so I had command blocks running detecting entities and killing them. When Y = 30 or above mobs started to spawn slowly. I have created around a 250 x 250 dark flat room and as i approach it in the center mobs gradually quit spawning down to not a single spawn with the command block confirming it. The spawning area is Y= 6 - 15 completely clear. No mobs are spawning in the caves above that level either also confirmed by the entity checks. Playing on hard difficulty also effecting superflat worlds. No mobs are on the ground when loaded in. Even on hard difficulties mobs will not show up until Y > 29. Including passive. Time was set to night.
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Can confirm mention above. Spawn area seemed to be zero when player is y <=30. When player is at 30, the spawn area appears. As the player go higher, spawn area expands.
It seems as though its not taking X and Z into spawning mechanics. I have tried to increase the new Simulation Distance feature with no change. Had no clue what all it affects but figured it was worth a try. Also silverfish stones will not spawn when destroyed.
In my world, the PLAYER is Y > 30, mobs spawns on lower Y level.
When the PLAYER is Y <= 30, no mobs spawn there.
I have checked the flat world with Creative mode, daylight cycle off, time set to night.