Odd -
I have a similar install (not using addon linker) but I don’t appear to have your issue.
I have the “deep” flightsim files on my C: (Microsoft.FlightSimulator_8wekyb3d8bbwe) but have the game files on my D: (Flight Simulator).
I’m using the Store version on PC…what are you using?
Interestingly, my C: files are only 3mbs (they are only temporary or cache files in my opinion) while my D: install is the full game (the Official file is 178gigs).
You’re saying you have a full install on C and D?