This was posted back in Patch 3 here: https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=903672

Still the case. While I was attempting to shoot a Goblin (the one guarding the blue clothed bard), it wouldn't let me target her through the open doorway with an arrow attack. Pathing made my character walk past the door's threshold before shooting.