after a rat spawns in world the world freezes no fps lag or server side lag everything in world just stops moving after like 10mins everything goes back to normal and the rats despawn or they stay in world game doesnt crash or give any errors ive noticed an error in the console wich created a crash log but there is no signs of an issue in game the rats even work correctly after spawned in
crash-2020-06-07_18.19.57-server.txt

this was an issue with a UUID being saved/loaded to the rat. This should no longer happen, not sure if it was fixed in 1.12 but is definitely fixed in 1.16