Well, maybe that's because I have done a poor job explaining my diagram! What I was trying to say is that if something is in the red zone, but nothing is in the middle non-red enclosure, the doors might open. If anything is in the middle, between the red zones, the doors won't open. I'm having a hard time testing this very well, but I do know if I hold a wrapped board over the door right above the articulating seam, the door opens and hits it. It's too hard to model all scenarios, so I was trying to generalize, just saying that those might be the blind spots.
edited to note: I don't really know where the hidden sensors are. Also, most X owners on this forum are complaining about weird sensitivity issues with their proximity sensors unrelated to the doors (bumper sensors). So it's possible this is all related to that, and there aren't really blind spots. I was just postulating and doing my best to say - if something's in that zone, maybe think twice.. for now.