SAS find nothing. Thtre are some other addon ports. But there no porblems there and also no duplicates. UUDD is not there at all.
Sometimes the Simple Airport Scanner might not be able to find conflicting AFCADs, but that doesn't mean there aren't, since you clearly have double jetways in your screenshot.
The only option you have, is to find it manually.
I hope you realize the problem doesn't have ANYTHING to do with GSX. According to your own report, jetways don't work even from the default SODE menu, so the issue is totally unrelated to GSX. If SODE cannot find the jetways, surely GSX cannot either, since it's supposed to get the information about jetways *from* SODE.
So, your question should be directed more to the scenery developers. It's totally unrelated to GSX. After you fix the issue with SODE, they will start working from GSX too.