The wooden fences in La Noscea, for example, used to stop you in your track if you run into them. And if I remember correctly, they changed it so you can just run through fences (fences that are like the background object, as a part of the scenery, not thee sturdy and high fences around camp) around the same time or same patch where they made our characters to be able to climb (or actually, run) up and down small ledges/cliffs instead of getting stuck on every raised ground on the way.

I can't recall fences and how they look like in Coerthas though, haven't been there much.