Mapping isn't a one time thing. You need to constantly be constantly updated. Bridges collapse, roads get washed out, lines get repainted and the list goes on. Even when you have it remapped regularly it can be wrong. Cedar road in Sonora California is a good example. They thankfully no longer have it connected, but they have a section of it mislabeled. If you look at the map, there's a section of Cedar road in the parking lot of Avalon Training. That's not actually Cedar road. Cedar road is actually the dirt road to the East of that. It used to be properly mapped to the dirt road. The problem with that is it quickly narrows and has major erosion. At one point there is a two foot drop off that is not safe to cross. Not sure how FSD would have handled it.