This should really be a FAQ, and I blame myself for not having put in the manual, because it was raised very often while testing.
GSX doesn't control, doesn't interact, doesn't write, doesn't affect and it's not affected by Jetways in every conceivable way!
Jetways will continue to operate as they always did before GSX, GSX will issue a reminder to use the Jetway, but that's just a text message, there's no interaction whatsoever between jetways, other than the basic notion of if that specific parking *has* a Jetway in the first place.
Which is easy if the scenery has FSX-compliant jetways, like our own or all default airports. On 3rd party airports with static jetways, GSX can't possibly know about them, unless we provide a specific customization file for that airport that, in the simplest form it's basically a list of which parking have jetways, since the "fake" ones can't be automatically detected.
So, anything you see with Jetways, has always been like that, and hasn't changed because of GSX.