"Round robin" flight plan question

Is there a way in MSFS to load a saved flight (from a .pln file) where the destination and departure are the same airport without having the in-sim GPS go haywire?

I'm working on recreating some military training routes in MSFS (using littlenavmap to create the routes), but every time I load the .pln, the in-sim GPS has the departure/destination airport as the next waypoint (it's going to the last waypoint in the flight, and there appears to be no way to re-sequence the GPS to earlier legs) , and this seems to be something fundamental with how MSFS deals with the flight plan, since the issue persists across every avionics combination in the sim, as well as third party aircraft that use the default GPS.