There's this one debris in my map you can clear but the zombies refuse to go one way through it. They're fine with going the other way, but even if I'm standing right across from them on the other side of the debris was (after I clear it) they refuse to walk towards me and instead take a longer route around to me. I checked out the area with ai_shownodes on and found that the lines connecting the nodes in that spot are red instead of blue, but I'm not sure what that means. Here's a picture, any help would be appreciated. None of the pathnodes involved are inside brushes or models either, by the way.