Yes I've seen them, as in my situation, that location is not reliable, in my experience, when your Spark suffers faults, the information your receive is not all correct. Twice I've had DJI aircraft land because of low
battery, in both cases i was able to track them to their location. But if the software is at fault as in your case, you wont find it where it's telling you it is. Just going by my experience, i could be completely wrong. Another thing to mention, the information you see on your phone app isn't always all that been recorded, I used log viewer website mentioned in this forum, and discovered it was much more detailed to the possible location of the last known location, the log viewer i discovered here, pointed to a location 100 meters away from where the DJI phone app was saying it was last seen, i had spent 3 hours in a frozen field looking, when in reality, it may have been no where near.