The pillagers spawn normally in the spawning area. I have experienced these phenomenons:
The older pillagers don't despawn.
The pillagers don't have natural enemy who controls the overspawning, where didn't generated iron golem cages.
The overspawning causes high server duty and lag.
Happens in non-raid mode.
The pillagers don't attack each other when they hit each other.
Would need despawning rate or spawning rate / pillager number control or natural enemy controlled spawning in the pillager outpost spawn box.
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Duplicate of MC-160367.