Unfortunately, Discovery Flight are not discovery flight att all for the moment. It is just a spawn location feature and it is very sad because it misses completely the concept of it.
A real Discovery Flight should be a programmed flight loaded as if you programmed it in the Flight Menu to guide you around and actually to discover what it has to be in the area proposed.
So what do you expect by having this new destination in the menu? It will only spawn you in the area with no clue where to go and what path to follow. Discovery Flight is crap in the meaning of what it should be.