Good work spotting that new driver! I also tracked it down on HP's support site and used that app to install the HP printer driver. During the installation process, I chose to only install the printer driver and NOT the scanner driver. Also, I chose to use the HP printer driver rather than the existing driver (presumably the AirPrint driver) near the end of the setup process. I tested printing from Word with success on two Macs running the latest macOS Big Sur. Keep in mind, you will need to install the HP driver on each Mac computer.
Meanwhile, my iPad prints boxed question marks when printing the same document. Sigh.
I checked the printer's Embedded Web Server for new firmware today, and it still shows that the firmware dated Aug 2, 2021, is the latest offering.
I'm curious if AirPrint in macOS Monterrey might have a fix for this issue. That OS update should be available before too long.