To ensure minimum lag and optimal player experience, we've introduced Entities Limits per Chunk.
Any entities exceeding the limit will despawn, regardless of the nametagged ones.
Some mobs are grouped like Hostile mobs, Farm animals, Pets, etc. and some have individual limits/chunk

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Blocks (limit per chunk):

• Hopper - 20

• Piston - 20

• StickyPiston - 20

• Observer - 20

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Animals (limit per chunk):

• Pig - 25

• Cow - 25

• Horse - 25

• Rabbit - 25

• Sheep - 25

• Chicken - 25

• Rabbit - 25

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Monsters (limit per chunk):

• Zombie - 8

• Skeleton - 8

• Slime - 8

• Creeper - 8

• Spider - 8

• Husk - 10

• Blaze - 15
   

Other (limit per chunk):

• Villager - 3

• IronGoldem - 6