Why are some PDFs scrambled when opened with Preview on Mac? Consider this PDF file for example. The text in this file appears scrambled when opened with Safari or Preview. However, the PDF is formatted fine when opened with Adobe Acrobat Reader DC or most 3rd party web browsers including but not limited to Gecko-based Firefox and Chromium-based Google Chrome, Microsoft Edge and Opera.
I wondered if it is because of some of the embedded fonts in the PDF file which perhaps I needed to install on my mac. So, I searched for these fonts and installed them on my system but to no avail. Perhaps it is a bug?
How would you deal with such PDF files when you want to primarily use Preview?

EDIT:
I am using macOS Catalina 10.15.6 and Preview 11.0. In the attached screenshot, the left rendering is by Preview and the right one is by Adobe Acrobat Reader DC.
The PDF does seem to display incorrectly on Catalina, but not on other versions of macOS.
Preflighting the PDF in Acrobat flags several instances of fonts that are not embedded. Acrobat and other versions of macOS seem to be able to substitute the system Arial and Times New Roman, but Catalina does not. I'd suggest that is the bug.
Exporting from Acrobat as PostScript and re-distilling will produce a PDF that works in Catalina.
Exporting from Preview in another version of macOS will also produce a version that works in Catalina. (Exporting, not just Save As..)
Ghostscript produces a single blank page when trying to process the PDF.
The file was originally created using Acrobat 3, in 2001 on some Windows OS. While such systems should have been creating perfectly decent PDFs, something seems to have gone wrong here.