I did my test like a mentioned earlier today.
With PMDG 777-300 and PMDG 737-800 (not BBJ2!!) in MSFS2024 with all settings to ultra.
GSX started without the problems like 2 days ago. I only used GSX for stairs and pushback. no boarding.
Beyond ATC and GSX working great together.
I still don't like that GSX are controlling my doors, specially not with the PMDG. Earlie non GSX Pro version was better where I got a beep to close my Entry 1 L

Anyway GSX didn't controlled my doors today.
Seems to be working after I run the FSDreamteam updater.
best regards and merry xmas
Mav
(now I have another problem which i never had before. ONAIR is shutting randomly down, but not a GSX issue...LOL