How does GSX "calculate" the number of pax and the amount of cargo to load?

[HeicoH]

For test purposes, I fly a short leg EDDL to EDDL w/o alternate, FENIX A320. No pax, no cargo. I generate a flight plan using Simbrief. Using 300 kg of extra fuel, it results in a ZFW of 44 tons and a GW of 47 tons.

Now I request boarding using GSX. It should board pilots only.
But this results in GSX telling me it is boarding 14 pax. Also, GSX loads 6 cargo containers into the airplane.

GSX obviously has read the Simbrief FP (button is green), but seems to ignore it.

[virtuali]

GSX doesn't change the cargo, it will always load 3 containers per loader.

GSX surely reads the Simbrief flight plan to the passenger number, and everybody use it. However, I never tried it with absolutely zero passengers. Perhaps the Simbrief won't even contain the passenger number tag in the http response, so it's possible this would cause an error that would force GSX to ignore the plan.