100% guaranteed it will eventually fail to stop in time.
There will always be edge cases that FSD Beta cannot predict properly. There are some humans that would end up in a collision in a similar situation. My point is that if we fixate on these cases, and demand that FSD Beta is flawless (0 collisions), we will always be disappointed. The goal is to have less collisions than humans do, and cause less death than humans do. But make no mistake - FSD Beta will cause collisions, and will cause deaths.