Just cam across this today as well.  Never seen it happen before and it is just extra clicks that we now have to make after changes have been made when reviewing the printed return.  Having an option to over ride the return or even auto number the return like it does when you print specific forms would be nice. So after the first time you print append _1 _2 _3 etc to the new PDF file.  Anything is better that having to confirm to overwrite.