Door pathing issue

From my own observation, open doors are treated the same as an empty space, blocking nothing from pathing through, be it air, liquid, or dupes.

When set to auto, if a dupe can't pass from the blocks adjacent to either side of the base of the closed door, they cannot path through it. If you dug out the one block directly to the right of the door's base, they should be able to pass through normally.

This behavior is also noticeable when you build a door horizontally across a 1-wide ladder shaft, with the base of the door inset into the wall. Since they can't pass from one base-adjacent block to the other, they can't get through.