Assuming both are 3rd party airports, once you exclude their ICAO from Jetway replacements ( so they are on the Right list ), you should see exactly the same jetways you had before in the scenery, so if they don't appear and can't be called, not even from the default ATC menu, that's surely not a GSX Problem.
However, be sure the relevant .BGL have been moved OUT from their folder:
\Addon Manager\MSFS\fsdreamteam-gsx-world-of-jetways\scenery\FSDT_WorldOfJetways
TO the backup folder:
\Addon Manager\MSFS\fsdreamteam-gsx-world-of-jetways\scenery\FSDT_WorldOfJetways_backup
This is what the Config panel in the Installer is supposed to do so, if you don't see the affected airport in the main folder, and you see it in the backup folder, then you are all fine, and there's no way GSX can possibly affect jetway behavior at that airports.
It goes without saying, all these operations must be performed when the simulator is not running. Any changes to the scenery list, will always require a restart.