I am able to load a Scarab into the Manticore just fine, takes 3 spaces, I have 3 other soldiers inside. I can fly around with it but woe unto me should I attempt to do a mission with it. I hit start mission and get stuck on the loading screen forever. Really frustrating as I’d like to see what it can do.
You might use the f12 report option so they can see the save state and see what is going on.