Entities have disappeared in localized areas

Entities have been deleted in localized areas of the world. List off known missing entities: all nametagged entities (donkey, mule, horse, tamed cats, tamed wolves, and villagers so far), unnamed tamed cats and wolves, brown mooshrooms, jukeboxes ❓ (unconfirmed), armor stands (empty and equipped), item frames, and paintings. entities mentioned are fully gone, not invisible. no hitboxes, no sounds, no visuals/shadow, as if they never existed. preexisting entities are still present in certain areas, but there are many missing in seemingly random places. still confirming other disappearances and affected entities