Alright, I just found out a tempporary solution after hundreds of attemps. If you make your airplane born on the runway or any other places except a gate or a ramp spot, then chose and taxi to the wanted gate with sode jetways, shut down engines, set parking brakes, now you call out GSX menu for any selections you can get sode works. Still very stupid but at least can use a little bit. By the way, today GSX got another update but nothing related to P3D/FSX, still doesn't solve this problem for sure.