No, it doesn’t happen to other airplanes and the option with „nobody“ doesn’t come up.
That indicates it's not a GSX problem, and it must be something in the integration with the airplane, possibly the very fact the airplane doesn't expect the new menu asking about boarding the crew that might come up ( or not, depending if the passenger number variable is set, and when )
We discussed it in the FSLabs forum and they say its a GSX problem and also tried to contact you.
It's possible I have missed some message because last week I was in vacation. I'll get in touch with them as soon as I can.