Now that stop signs are shown on the map, on my way home from work there's a stretch of semi-rural roadway that has no stop sign posted but shows a stop sign on the map. Interestingly, it (correctly) doesn't slow down there, and the other day once it passed that section the stop sign disappeared from the map. I'd never noticed that before.
On the other hand, I was driving through a stretch of neighborhood somewhere where there was a visible, posted stop sign that was not on the map. FSD recognized it and drew it on the console display...but the car just proceeded to start blowing through the intersection (good thing I intervened!)