On the first map there is an area where bots seem to have a navmesh problem with finding the path forward ( https://www.youtube.com/watch?v=vbqs2xebXGc&t=4m45s ). Coach somehow ended up in that spot (I didn't see how he got there) and stayed there until we restarted. Rochelle followed us until we were killed, and then she immediately teleported back to Coach.
There's another map (I think the 5th one) where we start with no ammo pile, no kits, and no weapons. A team that was beat down on the previous map will not be able to complete that map. We entered it with everyone incapped at least once, and about half the max ammo our weapons could carry. Tried it six times and the farthest we could get was to the street just after the first build you had to climb on top of. Didn't bother finishing the series due to this.
Still Needs Work