Printing Mac Office v16.70 (23021201)'s PowerPoint slide(s), to a HP OfficeJet Pro 8028e printer, show black solid box overlays.

[Ant]

Hello,

Printing Mac Office v16.70 (23021201)'s PowerPoint slide(s), to a HP
OfficeJet Pro 8028e printer, show black solid box overlays. It doesn't
matter if it is just one full page slide or multiple (e.g., 6) slides
per page. Also, it's not all slides. Just a few. Printing to PDF files
do not show this problem. This is in a 13.3" Intel 2020 MBP's macOS Big
Sur v11.7.4 with all updates. What's wrong?

Thank you for reading and hopefully answering soon. :)
--
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