ah that would make sense because I didn't have any access to catapults so I was confused how I was suppose to attack so I used archers to attack over the walls.
Edit: While we are in the topic of bug fixing. I did encounter another weird one where the bow of a ship can somehow fire across an entire map or long distances. The ship would lock onto someone and you move the ship and it continue to attack it. I can make a video next time if I encounter it.