Pathing Shaman pet can walk off on its own while guarding

[Erica]

I decided to be one of those annoying shams that camp the Hierophant in crypt. I make wolfie, have him guard in the middle of the hierophants room then after a few minutes he suddenly starts walking away and finds a train to pull. He was pathing towards the exit of crypt.

This happened again to me, but I was able to dismiss him in time.