Hummmm....
I just completed a form that I have that auto-submitted and it worked fine. I did open up the original Document to make sure tabs are available, but it was created BEFORE tabs were a thing. Maybe that has something to do with it?
I hope this does not cause issues. I will be using a bunch of these soon!
Maybe it is only an issue if a NEW document (now that Tabs are a thing) is created/used?
Jeremy