There have been a few threads about this. Mobs don't teleport anymore. They cast the spell and don't go anywhere. It's great that mobs and pets don't teleport into houses anymore, but if this was the fix, this is one of the sorriest bug fixes I have ever seen. If it isn't the fix, then it is a bug that needs to be fixed - it has taken an already anaemic and predictable mob a.i. and made it even more anaemic and predictable.