Re: "...a [Lidar] blind spot low to the ground all around the car."
Drunk crawling. Victim of previous accident. Someone who tripped. Recumbent bicycle. Kid sitting on a skateboard.
Speed bump. Log in the road. Bricks, blocks, other obstructions.
An autonomous car has to scan for any and all obstructions ahead, and also be aware of hazards approaching from the sides and rear.
There is no excuse for not detecting someone wheeling a bike. Far smaller targets should be detected and acted on.