Hey guys,
I'm positive I've figured the way to reproduce this bug so that the staff can try fixing it;
I've flown yesterday and today between two FSDT airports; KORD & PHNL. Both flights around 8 hours long with complex addons [PMDG 777 & 747]
Upon arrival at PHNL the jetways were sunken. I took a look in the configuration, it said elevation 4. I pressed the plane button to the right, still said 4. I pressed apply and the jetways were back to normal.
On the way back to KORD the jetways were floating rather high in the sky. This time instead of going into the configurator I simply restarted couatl and the problem was fixed again.
So in short, I think the proceedure is to fly a long haul from/to an airport that has custom GSX jetways. I have not encountered this with sode jetways yet, but I did fly CYUL-MMUN-CYYZ a few days ago and the jetways were fine, although these flights didn't exceed the 5 hour block.
I must mention that I do not use any custom configs for either of these airports and the last GSX version I had was very old, so I didn't have any updates from august up until now.
Also not sure if this could be related, but after resetting the alt and saving it in a config for PHNL, my plane didn't display the new sinking pushback bug. [plane will sink a tiny bit right as pushback starts and pops back up as it ends]