Your thread has been replied to, it hasn't been *further* replied to, because we still need to understand why this happens.
We found a couple of 3rd party airports that have an unusual structure, that is a parking NOT connected with the usual parking path connection as its last edge ( as it normally is, with 99.99% of the sceneries out there ), but instead has the last edge flagged as it was a regular taxiway.
I cannot figure out how is even possible to make a scenery like that, because the editor simply doesn't allow it: when you create a parking and connect it to a node of a taxiway, the path automatically created by the DevMode editor is not a taxiway, but a apron parking path ( which shows up in green in the editor ) so, my theory is either these sceneries have been made with a very old version of the DevMode editor and has never been updated ever since, or they haven't even made with DevMode editor, and might have been possibly converted in some way from FSX/P3D and/or made with external editors like ADE, that might not exactly conform to the way the native DevMode editor in the sim works.
It's difficult to understand how many sceneries are made like this, since we only got a few reports but, the problem is, supporting this very unusual structure would be very difficult, requiring lots of structural changes to GSX that might not be worth it, if it only affects few sceneries.