This problem doesn't have anything to do with the parking brake ignored only after exiting a QuickEdit pushback that has been discussed elsewhere, and it's confirmed will be looked at.
Instead, it's not really a bug, but rather that, some 3rd party airplanes, depending on their modeling of ground handling, don't react well to the "Pushback Raise" feature in GSX, which realistically raise the airplane a bit when a Towbarless truck is used.
It's really impossible to test all airplanes, since their reaction might change depending on their load, we can only say it works fine with default airplanes, and that's why, the airplane customization editor page in GSX has an option to disable this feature, if you find a specific airplane has a problem with it.