As the title say the horse will get hung up on the fence because it make to ride of a turn
I recommend attaching a picture with the exact location (aka one with horse being stuck + minimap, and one with world map) so the GMs actually know what to report
I assume this is with sprint on. Cause i know a lot of bridges in the game cannot be crossed autopathing with sprint on. The one leading to olvia from velia always gets your horse in water. And there's a problem with a couple around heidel too.
(Then also please submit it as an issue with screenshot and explanation so there is at least a chance to be fixed)