Hello @FlyingRaccoon,
I still have it unfortunately, but it is happening very randomly.
I tried to replace the FUEL_SYSTEM with a legacy FUEL section, and it seems to fix the problem, so I think it is related to a regression in the fuel system. My guess it that it could be linked to this: [FS2020 port] FUEL_SYSTEM lines to engines drain
Kind regards,
Romain