I am observing dupes opening a door but then do not step though but freeze. This fixes itself after a while, but it is irritating. I have seen this most often when two dupes want to pass through a door at the same time, the second dupe then has the problem. It also happens when the activity the dupe wants to do is very close to the other side of the door. In such a case I see them do their task while frozen.
it's something that seems to occur randomly.