I have a incomplete jet airliner project made for MSFS 2020. I want to be able to port it over to MSFS 2024 before making a native 2024 version. Everything seems to work or can easily be fixed, except the aircraft loads on runways with essentially empty fuel tanks. Loading at a gate, the tanks are half full. Filling the tanks in the free flight UI before spawning has no effect.
What is the reason for this behavior and how can I fix it?