Why don't all scenery addons show in world map and as POIs?

Discussion Hub World Discovery
1

As per question above: why do some addon sceneries show on the world map and as POIs in game and others don’t?
This one for instance: Cinque Terre, Liguria, Italy for Microsoft Flight Simulator | MSFS
I can clearly see it at work when I fly over but there are no POIs shown, as opposed to this one: Italy - Porto Venere for Microsoft Flight Simulator | MSFS which shows in map, POI and it’s clearly working.
The list can go on… Matterhorn for Microsoft Flight Simulator | MSFS does not show in the map or as POI (but I can see the different textures when I fly over), but this one does show: Italy - Sassolungo for Microsoft Flight Simulator | MSFS

Am I doing something wrong or is there something coded into the addons that does make them not show up in the map? Can I do something about it perhaps changing a couple of lines of code?
Thanks!

2

POI markers are similar to scenery landmarks (e.g. buildings, airports …), which need to be defined explicitly by addon author.
The reason why many addons are without POI marks: I think many authors are just too busy with the modeling, or would rather leave your the fun of discoverying.

While personally I would like to see as many explicit POIs as possible, which can give me clear goal. That’s why I’m working on making supplementary POI marker addons. Welcome to check out my uploads to see if they can be of any help.