The lady was walking the bike at the edge of a light cone. The inner cam was actually filming in IR. Uber cars have IR cameras, LIDAR and an also multiple radar sensors.

My guess is that the algorithms have never met a person crossing the street with a bicycle during night time so they just ignored it or considered it to be a glitch.

You can have to approaches regarding labeling driving situations. Either you label with positive tags the situations where the car needs to react. Or you label with positive tags the normal situations when the car does nothing.

Depending on the two approaches you can have a car that kills pedestrians that appear in weird circumstances. I also bet a pedestrian that ducks in the middle of a lane would 100% be killed by a car. Or two people having sex while standing in the middle of a lane.

The other situation you have cars avoiding invisible obstacles that may appear due to some aberrations from sensors (which are far from perfect).