Name tagged mobs and pets despawning.

I had a name tagged charged creeper in my mob museum de-spawn as well as a zombie and a slime, also my best horse has also despawned, I have 5 horses total and out of the ones that could of despawned of course it was favourite and most op horse I have. Also some un named sheep has disappeared from my farm, I had 1 of every color for my wool farm. This has been happening since 1.14 with the occasional freeze. It seems every time the game freezes (so I have to quit the game and re launch it) more of my named mobs despawn it's so frustrating.