Got an update. I've started to run into quite a few CTD's when using GSX. So, I've uninstalled GSX and grabbed a freeware plugin to take GSX's place for the time being and test some things out. The default jetways are working correctly without issues now, and no CTD's so far since uninstalling GSX.
The default jetways have the exact same issues, this is very well know and it has even been acknowledged by Asobo themselves, have you read my post on Asobo forum, where I posted several screenshots of *default* jetways at *default* airports showing the problem, and the subsequent confirmation from Asobo?
If you had additional issues with GSX jetways only, like attaching to the wrong gate, that's only because if you used 3rd party airports, you MUST exclude ALL of them from Jetway replacements using the Config panel in the GSX installer, because GSX jetways are only meant to be used on default airports. They can't work on 3rd party airports, because the parking names/positions don't match, so they will be all sort of issues related to that.
Whether this can even cause a CTD, we don't know, it's possible a conflict between parking arrangement in the GSX replacement files and the different arrangement in the 3rd party airport might trigger some kind of bug in the sim but, this doesn't surely happen if GSX is used correctly, by ensuring all ICAO for 3rd party airports you have has been disabled in GSX.