Freeze villager and pets

dear Minecraft Dev i want reporting a bug that a lilttle bit annoying and really distrub me i was play alone normal mode  do normal thing i was afk with my cat and i go to portal gonto Nether my cat was inside tht and i try to bring him to upper world wheni try to make him sit he frezze but still walk around the house cause of that i try restart the game and all gone all the chicken villager horse and my cat dear Dev a please fix this bug.this thing not happen one timei play my other world and same thing happen and all my pets gone and they always gone when i play everytime i need find new pet and other cow&other animal when this happen