Other self driving implementations e.g. Cruise, Waymo have LiDAR which is an additional and in my opinion necessary sensor for detecting objects.
Because in this case it sure looks like a phantom breaking issue.
https://www.motorsafety.org/us-government-investigates-1-7-m...
https://www.macheforum.com/site/threads/phantom-braking-expe...
https://www.chevybolt.org/threads/ok-lets-talk-phantom-braki...
Anyone know how much a LiDAR system cost nowadays?