Sims walk into the house to knock on the door. This bug occurs with any base game door, and I have not been able to replicate it with any other door. Tested door rotation in both directions and bug...
Ideas
I had this issue before. Whenever it happened to me, my door was on the wrong way. Check to see if the green arrows at the bottom of the door, when you pick it up, are facing the outside (grass area). Mine was facing the inside of the house, that is why this happened to me.
Edit: I see you tested it both ways, sorry for the reply. I don't have this issue right now