Mobs still glitching on spawn

Okay so first I go in to find that two of my horses are missing from the pen I had them in (not sure when they disappeared but I'm pretty sure it was after I installed the latest update) and they both had saddles on, one wearing gold armour AND it had a name tag and the other wearing diamond armour. I go back to find instead just one horse I had tamed before and left outside the pen with no saddle/armour since it was slow.
And then I'm walking around, I find first that all five cows I had just went poof and disappeared. Okay great, I just thought they might have despawned so I switch to creative and respawn and name them all.
Next, I'm walking around and yet again two chickens magically manage to get out of their house, in the past they would somehow end up in the sheep pen while a sheep or two got out as well, this time they're just walking around (for some reason it seems like having two extra chickens has been glitchy)
Then, I'm heading home after spending 10 minutes trying to find my horses hoping against all hope that they still exist and that I can find them because it's not like I can ever get their exact stats back even if I respawn them, and suddenly out of nowhere like a literal herd of donkeys spawn below me, and even though they're not tamed, they still follow the wheat I'm holding (but that could just be a donkey thing idk) and it just kind of ruined the fun of discovery in the game when I had been trying at various times for days to get one donkey to spawn, then BAM there's like five of them. Unless they're meant to spawn like that in herds?
Anyways, PLEASE do your best to fix the mob teleporting glitch ASAP! It's really not fair that I (and probably others) have to switch to creative just to cheat and get back those mobs because we happened to fall victim to a reoccurring glitch. It doesn't make this wonderful and creative game seem as stable or as fun anymore, and I really do love the game. Thank you so much for creating it and I hope this report helps to improve it and provide you with information in the near future :')