The LEAF has an Occupant Classification System with sensors installed under the passenger seat. It's designed to suppress the airbag in the event that it detects the presence of a child or infant, or an adult who is seated in such a way that would cause injury to them if the airbag deploys (such as leaning too far forward). It does so by attempting to determine the weight and position of the occupant.
That means the passenger is either leaning in their seat in such a way that causes the car to determine it's safer for the airbag to be disabled... or... there's a faulty or miscalibrated sensor causing the OCS to disable the airbag.
If the passenger isn't leaning, I would take the car into the dealer for repairs.
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