Every time lions play Asphalt 9, it's inspiration to revisit this.  The mane problem is creating the same entertaining gameplay & map in a flight simulator that is possible in a road racer.  The other problem is making it something lions are going to use every day.  Lions can play Asphalt 9 every day, even though there's no point.  There's no way to advance & there isn't any challenge, but it provides engagement with a physics system & sensation of speed.

Most often, a solution randomly happens to be found, like the so called "better collada exporter" on the godot page.  There's no indication of what it is or that it's a .zip file, but it actually is a plugin someone randomly put on the godot page & it does slightly better with some of the normals.  Exporting the most basic 3D data like normals is hit or miss.