I bought GSX in late September.
The "Catering vehicles are on their way" bug still does exist when using the Majestic Q400.
The scenario is this:
After requesting catering, the vehicles show up, demand the R4 door to be opened. Then they do their thing and then once catering is loaded, the system sends a message to close the R4 door. With the door closed, they drive away.
However, the system won't start boarding upon request, but informs that boarding will commence once other services finish...
It was said in 2014 that a solution (not a fix, a final solution) is on the way. Yet it is clearly unsolved as of yet.
Best regards,
Zsolt