[HamletEagle]

This isn't exactly the type of "hidden zone" ROG was updated to detect. It detects mostly rooms under/above the map, not areas that are connected to the map but separated by an invisible wall.
As I said before, to filter these places properly we need to run a pathfinding algorithm and see if the zone can be reached or not. While a very inneficient version can be easily implemented, it will make the include extremely slow, probably to the point where it's unusable. Better implementations will require a module and a lot of work.