[MC-235243] Monsters not spawning in new 1.17.1 chunks

I have been mineing and noticeing for several days now that almost nothing spawns in new caves. I always go to new chunks couse my world is from 1.12 and I mined everything around spawn. I can tell for sure that something is wrong with spawn rates. In a 2h mine session (not branch minening) I killed one creaper and one sceleton. Nothing at all in new caves. Monsters spawn on surface during the night. Local difficulty in new chunks is around 3. Old chunks around 6.

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Avoma 2021-08-25T16:31:39Z

Please provide some screenshots or videos of this issue occurring whilst the F3 debug screen is enabled.

McCrafter 2021-08-25T16:35:41Z

Mobs spawn normally in new world. With local difficulty of around 2.

McCrafter 2021-08-25T18:19:50Z

Ok I managed to fix it. Created new world with same seed. Copied everything from old world except for level.dat, changed few parameters with nbt so that it maches my old world and it works great n

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ow.

McCrafter 2021-08-29T14:20:59Z

But still I fell like there used to be mobs around every corner before, but now rates are very low (1h mineing session = 5 monsters)