When going into the elevator at B (the building between B and the canal), I push the button to go up.

It lights up red but nothing happens. If you wait a couple of seconds, you are on the top floor and the background changes. It seems the door mechanic has stopped working and all that changes is the background you see from inside the elevator.

It seems to only happen in the elevator at B for me. Quite unnerving as you don't know if it's actually going up or not.