Yes, my intuition was correct; it seems like your build didn't fully compile.
Can you please go to this path depending on your version:
MS Store version: C:\Users\yournamehere\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalState\packages\microsoft-aircraft-an225\work
Steam: C:\Users\yournamehere\AppData\Roaming\Microsoft Flight Simulator\Packages\microsoft-aircraft-an225\work
and delete the contents of the work folder. Then try to start a flight in the Antonov again.
Lemme know if this fixes your issue ๐