Why when I view my federal return online, it’s 8 pages long but if I choose to print & mail my form, it only has 4 pages to print? (Even the bottom of pages says x of 8)

When I view the form online, it shows me 8 pages but if I choose the option to “print and mail” it only allows me to print 4 pages. And the pages say “1 of 8, 3 of 8, 5 of 8, and 8 of 8”.. where are the rest of the pages? Or is the barcode all they technically need and therefore I don’t need to mail all 8 pages? (Sorry if this was confusing)