In order to allow for an optimized and balanced mob spawning, several changes have been made to mob spawning which could alter the way mob farms work.
Piglin has a hostile mob cap of 15 hostile mobs per player rather than the vanilla cap of 70 per world.
Piglin has a soft despawn range of 28 and a hard despawn range of 96. Compare this to vanilla's soft range of 32 and hard range of 128.
Piglin has a ticking view distance of 3 rather than the default of 10.
Piglin attempts to spawn in hostile mobs every 4 ticks rather than every tick.
If more than 4 iron golems are alive within a radius, nearby villages will not spawn any new iron golems.
Villagers tick significantly less often when the server's tps is below 19.
Zombies are not agressive towards villagers when the server's tps is below 19.