This one is actually fixed in FS24, in so far as I can tell. If it has happened to anyone it would be interesting to get the details on how.
I’ve changed aircraft, livery, and even aircraft type (eg. from hot air balloon to plane) and it hasn’t reset my parking space yet.
It has seemingly reset my livery to a default one, I’m not sure of the circumstances yet and anyway that would be a different bug altogether.