Done Passive mob on Beehappy ( chickens )

hi
passive mob when released from safari net or lasso just despawn, only i magic forest biome they stay on ground but instead just respawn after a while it happend with my chickens

is this made as a lag prevention ? it only happens with chickens maybe its something wrong with my island ( not even spawner egg works to make chickens )

 

Hey MakakPL maybe you have more than 16 mobs in that chunk if not I really don't know what could be doing that.

 

only chickens in my chunk ..

 

That's really weird. I don't know now...