How the jetways are made in this scenery ? If they are made with the standard method, they are totally unrelated to GSX so, if they work (or not), it's entirely something that's happening in the scenery, and GSX doesn't know anything about it, or change anything.
The only case where there's an interaction between GSX and jetways, is when a scenery is made with SODE jetways, but I cannot see either in reviews or in the Aerosoft site for that scenery any indication that it supports SODE.