Solved mobs not spawning on my 1.18.1 minecraft server

[20_NickName_20]

I have minecraft server on paper.
I can spawn mobs myself, but they don't spawn naturally. (only patrols)
There is a datapack in world.
World is a big (about 200 X 200 blocks) dirt platform.
Plugins:
ChestsPlusPlus
Essentials
LoginSecurity
LuckPerms
SimpleLay
SkinsRestorer
WorldEdit
WorldGuard
ZombieApocalypse

Edit: biome was void.

 

[_Pesto]

I'd suggest checking WorldGuard global flags and your spigot and bukkit config files (specifically the mob limit sections)