Yes, this is a known issue. And there is a workaround. You have to manually change a line in a .json file. It is already covered here on the forum.
Navigraph and MSFS World map - All airports marked as 3rd party - Third Party Addon Discussion / Tools & Utilities - Microsoft Flight Simulator Forums
You will find the manifest.json file in C:\Users\Goose\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Community\navigraph-navdata
After that all stock airport are again not marked as third party content…
And of course back to asking a resident for plugging in your electric plane😉