I have had this happen to me, and so has another person. My world and cat were new, the other person had a cat from before the update. My cat was sitting on a chest and I put a lead on it and it started “running” away. It was fast enough to be running, but it looked like it was just sitting. I was standing still, and it moved far away enough for the lead to break. I tried sitting it up, but it didn’t stop running when I did. I tried logging out but it had despawned.
My cat, and entire world came after the update.
I didn’t do anything special to fix the bug for myself , I’m sorry that I can’t help you all.
I just updated to 1.8.1 and the problem has disappeared for me! I logged in for the first time after the update, and I went to the store. My pack wasn’t downloading until I clicked on download. Then it started downloading very quickly. Then it started importing. Then it was done, the bug it gone for me.
This bug may be connected to a different bug. Sometimes, when I log back in I will get the teleporting to your spawn point in the sky bug. Note that I do get this bug, invisible wall or not, but it seems to happen more when I log out while trapped by an invisible wall. This is also in 1.8.
I have had this happen to me multiple times, with or without horses. A invisible wall will appear in front and then behind me. It normally fixes itself when I reload the world. A word of cation when you do this, something may happen when you do this that should not have happened. I was riding my horse, the wall appeared, I reloaded the game, and when I came back a creeper had blown up my horse. Now I put my horses in a safe place before I do this and it seems to work for anyone in 1.8.
This happened to me with the Norse mythology pack on iOS.
The rest is on the bug “Cat ran away”