First I'm sorry for the tittle, I just don't know what a correct tittle for this bug, I searched this kind of problem but can't find anyone post it, please tell me if I'm wrong.
So the problem is the saloon door feels like invisible once you place it, you can see texture and mesh of Saloon door placed at where you want, but it act nothing. No button indicator to open it, and you can walk through that door. I thought saloon door will swing when you walk to it, I guess I'm wrong.. Here some pictures of it: