bRename method not working

I have created a fillable form with an "Add Page" button on the final page to duplicate the final page and allow extra space as needed. The page is duplicating correctly, but all of the information entered in the fields on the initial page is copied to the new page as well. I have tried using the bRename method to make sure the fields on the duplicated page have different names and do not carry information from the previous page over, but it does not seem to be doing anything. Here is the JavaScript I am using for the button:

var a = this.getTemplate ("Positive Pay Users"); a.spawn({bRename:true});

Any help is appreciated! Thank you!