I wrote an article about challenges that many deaf and hard of hearing people (including myself) experience when communicating with people who wear regular masks. Clear masks are mentioned in the article.
Lipreading is challenging enough for me as a deaf person. It gives only about 30% of visual information and the rest is a lot of guesswork and filling in the blanks. When a person wears a mask, it’s a nightmare for me as well as for many other deaf and hard of hearing people. It’s difficult even for those who wear hearing devices.