I named a chicken, so it wouldn't disappear, I was in the nether, and died a few times, then, i come back to my barn to see the chicken was gone, this happens when we see blocks in the air, and go to the nether. me and my friend lost over 20 animals, and even when we name them, they still disappear! I also looked outside for all of the animals, but none had a name tag on them. this happens with all animals. they just vanish!