I have been playing a LAN world on 1.14 with my family. I had 4 dogs, and 4 cats, all sitting outside my enchanting table building, none of them were named with nametags, and then we log on and i found them gone, i think upgrading to 1.14.1 caused it, or it was just convenient timing. Only 2 dogs remained.
And now again, having 3 dogs (2 of them nametagged) and 4 cats (3 of them nametagged), all sitting next to my bed outside of my enchanting table house, are now all gone. Theres no way they couldve suffocated or teleported elsewhere. they just despawned or something.
I figured since i nametagged all the ones i didnt want to despawn that they wouldnt, but that didnt seem to help.