PFAS research is still in the early stages, which means issues with PFAS crop up all the time to surprise researchers like Michigan State University professor Cheryl Murphy.
PFAS, per- and polyfluoroalkyl substances, are known as Forever Chemicals because of their reluctance to break down in humans. They can be in the food chain, drinking water and are found in common items in everyday commercial use like water-repellent clothing, dental floss and non-stick cookware.
Great Lakes Now
https://www.greatlakesnow.org/2022/04/pfas-solution-widespread-sources/