I have had six horses, named and no,t despawn from 7x7 pens while tethered. The posts they were attached to still have the lead tied to them, but there is no horse or tether, just the tied on bit. This has happened on both sides of my stable, and while I play Bedrock and can't be certain, the dimensions and placement of the missing horses makes me question the chunk border relation.
I also have villagers that aren't taking jobs , even when every work station is nearby and there are fewer villagers than stations. Some newly bred villagers do take jobs when grown up, but some never do. I'm also getting nitwits, so they're not nitwits rendering improperly so far as I can tell. Playing on windows 10 in a realm.