I know the seat has an occupancy sensor but there are times where you might have a heavy bag on the seat and it senses that its a person the weight requirement is not much to activate the sensor to ready status on the passenger seat. Also the computer detects which passenger will be more in need of a bag in such a wreck as this one and it will trigger that bag only rather than triggering all bags. It’s got a mind of its own, you really can't predict when the bag will deploy and which one will deploy, therefore just be cautious and wear your seatbelt. These are 2nd generation SMART AIRBAGS. They are smart for a reason they have various sensors in addition to the regular sensors to determine what is really needed or not.

Either that or the airbag had a malfunction and it was not serviced. See when sensors are responsible for things like this you can't always count on something occurring exactly as one predicts.

Accidents vary and point of impacts vary. The point of impacts that Chrysler might have done to test the car can and are different from the real accident out in the street therefore the airbag will trigger differently, not at all, or partially (like in this car only the passenger one).