After update, it won't work, it kept saying "The parking is isolated. No Ground service available". I slewed around and tested to see if it works.
AHHH, finally something useful! Warning messages are there for a reason, so you can understand the problem is NOT caused by GSX, but the scenery has an issue that, in previous versions, would probably cause a crash.
The updated version CORRECTLY DETECTS a problem found in so many 3rd party sceneries that had mistakes like these. In this case, it's an orphaned parking. Such parkings would likely cause errors with some services, because they wouldn't be able to reach that parking. Even AI planes cannot use them.
You think it "worked" before, but only because you might got lucky in the random selection of the departure place for the vehicles but, sooner or later, you would have seen a GSX error message, because it couldn't calculate the optimal path for the vehicles to reach that parking, since there are NO paths connecting to it, and this is obviously an error of the scenery.
So, instead of just crashing, we know give a warning, so it would have been clear that GSX is correctly and intentionally discarding a parking for a reason, not because of some GSX "bug".
Or, at least, we THOUGHT the message was clear enough. Apparently, it isn't...