Problem with upwardDirection x = -1.0 and people walking from right to left or y = -1.0 and downwards movement

If stairs are added with property upwardDirection: x = -1.0 and pedestrians are walking from right to left or y = -1.0 and peds moving downwards in the scenario, they will get stuck in the stairs. For pedestrians walking from left to right or upwards, no problem could be observed for both x or y \in {-1,0, 1.0} and x or y \in {-1.0, -1.0 }