When adding variants of new doors to each of the houses in the village, I noticed some of the villagers were not able to get in or out of their homes. So, I'm assuming villagers just cannot open any of the new door variants except the oak wood door. These doors behave like the iron door BUT the wooden doors have a door knob the iron door does NOT have a door knob.

To further test this. Steps to duplicate:
-Place 4 doors of each variant in a square (See photo attached.)
-Place a villager inside each.
We assume the villager can open all variants of the wooden door since they all have a door knob but they can't.