When bookmarking books to include ISBNs with 020 |z's in RDA records as well as 020 |a's

A lot of the large record downloads from suppliers and other sources set ISBNs for e-books with |z (used for faulty ISBNs) at the front, not |a's. This is because the ISBNs are not in the actual e-book text (an absurd and pointless cataloguing practice that still persists despite NISO recently suggesting it is out-of-date). The ISBNs do appear in the public records but currently only 020 |a's are added to item records when bookmarking.

The lack of these valid ISBNs in items is a nuisance when trying to data match in Reports and Excel.

It would be great if when bookmarking books for the ISBNs with |z's to be added to the item as well as any 020 |a's to improve items and the data for academics and students.