This is quite fascinating since this problem was reported as fixed in June 2023, and I didn't even own GSX Pro back then.
You are confusing the effect with the cause. ANY error that might happen in the airplane dialog would cause the same EFFECT (inability to save the airplane), but there might be completely different CAUSES for it, so the problem fixed in 2023 was something else, another cause that would result in the same effect.
THIS specific problem has been fixed in an hotfix after 3.2.3, as I've said.
