all of my animals/entities are despawning

a large amount ( not all ) of entities in my world have randomly despawned like animals in pens or villagers far away in boxes, I don't have much information on it but it only started to happen when we updated to the new update. I am not sure how to reproduce but it seems to have something to do with logging out and back in because when you leave you will still have animals. if I get any more information I will add it