But I do still recognize when someone tells me a valid question and it's target.
And I tried to help you the best I could with the information I had available.
And the question was not related to the PMDG 747, nor if anybody has a valid work-around nor how I should change the usage to avoid an irrational and unlogical sequence.
As far as I know, GSX on its own doesn't care about the aircraft type as far as the pushback process is concerned. It wasn't until somebody else mentioned the timing difference with the different tugs that I was able to confirm it myself, and the video shows it, even if I did have to use the 747 to confirm it. With the towbar tug, I was able to get it to work just fine without a delay. With the towbarless tug, there was, in fact, a delay. Why that is, I have no idea.
This bother's me already for a long time, as well as several other complaints. Plus, nothing works properly with GSX anymore. Really nothing. Even turn-arounds are not possible anymore because the fuel truck does not arrive despite its requested...
One thing I have noticed is if you wait for the catering process to show as completed and then call the fuel truck, the fuel truck will show up. If you do it before that, it's hit or miss. I realize it's probably not the answer you're looking for, but unless they can replicate it and find a way to fix it (I don't think anybody has reported it before), that's probably the best you can do for now.