Impressive demonstration and
Impressive demonstration and clearly a repeatable fault in Autopilot.
The blue lane lines and blue steering wheel indicate AP was engaged and was (meant to be) in control of the vehicle.
In our X, under these conditions, AP1 will stop the vehicle, regardless of a blue vehicle or any other vehicles. Still, I've seen errors (such as vehicles ahead changing lanes or the road merging or curving) in ways that can deceive the system
.
In simple terms, this is a potentially fatal flaw and must be resolved.