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.