When Uber driving towards skalitz, Hans, so far, always get’s his horse terribly stuck on random rocks besides Talmberg roads.
Didn´t have that problem, but in the quest The Prey it took him a minute to leave the castle because he constantly ran into the fence from the tournament arena 
Seems like AI on horses are not the most intelligent. Maybe that´s a reason why there are no travellers on horses 
I had this problem with old laughing boy Capon. I went a little bit in front and After a few minutes he eventually ‘freed’ himself and got back to the road
I had the same problem with him riding towards the last camp behind Neuhof in the end he went into the fences and walls the bushes dude like he was drunk