The broken building closest to the Shaleback boss (waterskin) - just across the creek from him/her - there is a skeleton that goes into the ground and will not come back out. Thrall wastes too much time trying to fight it. There was a bog report on this area before. Was hoping the update covered it too.
Edit: Also, I watched the 3 undead (2 skele and 1 blue ghoul), right before the steps to the final boss area go into the ground, before coming back out to play. It doesn’t seem like that bog fix worked at all.