Fonts not displaying in PDFs after upgrading to Sequoia

Yesterday, I updated 2 iMacs to Sequoia v15.3.2. Today, I downloaded a bank statement PDF and the text was not displaying. Past PDFs from this same bank have the same issue. PDFs from other sources, past and present, seem to be fine.

Trying to narrow down the problem, I compared the 2 iMacs. On iMac #1, the bank's PDFs are unreadable. On iMac #2, the PDFs are readable. I followed multiple suggestions to fix the problem, to no avail. 

• Reset Fonts in Font Book (several times, with a restart after each reset)
• Validated all fonts
• Eliminated any personal fonts
• Uninstalled and reinstalled Adobe Acrobat Pro
• Cleaned up cache
• Ran a maintenance program
• Ran various Acrobat utilities to embed the fonts. The only success was to convert the fonts to outline.
• The Document Properties show Arial (embedded Subset) and a strange series of fonts named "T3Font_58, T3Font_59", etc.

I was able to edit the PDF and change all of the fonts to Arial. But what a pain in the neck!