Okay, so you are telling me that you develop GSX and do not include working GSX jetways placed at the right spot and looking the right way at JFK V2? I can't quite understand that
Obviously not, I'm telling you found ONE Jetway in ONE gate that didn't solve from that position on that particular airplane, you seem to have understood that "all" jetways at "all" position at JFK don't work, which not obviously the case.
Since GSX is included with JFK V2 for free, and the fix is really TRIVIAL, I obviously gave you what would be the easiest and fastest solution so you could use that gate immediately, instead of waiting for a fix. You could have done it even without restarting the sim: we added full customization in GSX for a reason, so you could use it to fix things like this.
And no, your customizations won't be overridden by our updates, since they are stored in your user profile, not the scenery own folder.