ArduPlane: GCS unable to resume mission when RTL_AUTOLAND != 0

In order for QGC to support Resume Mission after a battery change it remembers the last waypoint which was current when the vehicle leaves Auto flight mode. I believe this is the same as Mission Planner, but not fully sure. If the vehicle has RTL_AUTOLAND != 0 when the user changes to RTL flight mode, it starts the RTL but it does not exit out of Auto. This in turn leads to the inability to use Resume Mission functionality.

Is there some other way to do this. Seems like an important use case for fixed wing.

QGC Issue here: https://github.com/mavlink/qgroundcontrol/issues/6286