Yeah, that’s the thing. It’s just how the airport AFCAD data is made. If the airport parking type is incorrectly set to a Gate type, the ATC will just see it as such, even if there’s no jetway in there. So the devil is in the detail, making the airport data as accurate and as clean as possible is a huge task to do, I’m not surprised if developers just copy and paste gate types and place it everywhere without a second thought. But it does impact the ATC ability to properly read them and assign you the right parking for your aircraft.
I’m not sure if this helps, but have you tried using the GSX Pro addon?