The issue mentioned by Antoine is not a bug, it's just that Aerofly FS conceptually does not consider individual TSC files at the same location, e.g. autoheight will only work if XREF objects, 3D runway meshes and other stuff is defined in a single TSC file otherwise we would have to implement a priority system which is not a clean solution.
So as a short answer: Please define 3D runway meshes, XREF objects and all other 3D objects using auto height in a single TSC file.
it is unfortunately not the case. In my example both xref and cultivation were called from the same tsc as the airport.
So yes, I’m afraid it’s a bug !