[salawat]

The report indicates the system ignores stationary objects. I would not be surprised if a suddenly decelerated car in front of the system effectively vanished from the car's situational awareness. Your scenario does not seem that far-fetched.

An attentive human would realize something horrible had happened and perhaps reacted accordingly. A disengaged or otherwise distracted one may not have the reaction time necessary to stop the system from plowing right into the situation to make it worse.