The following month, a drone’s motor shut off as it switched from an upward flight path to flying straight ahead. Two safety features — one that’s supposed to land the drone in this type of situation and another that stabilizes the drone — both failed. As a result, the drone flipped upside down and dropped from 160 feet in the air, leading to a brush fire that stretched across 25 acres. It was later put out by the local fire department.
Like most burn up tech work it is missing relevant safety standards for software design and verification so, yeah, it's going to crash and burn a lot. There's no reason why a company like Amazon would do anything other than the bare minimum in terms of device safety and testing unless they are compelled to by some state agency. Faster development = shiny new demos for shareholders = more investment capital = middle and high level managers get big bonuses.