This started a couple months ago. Highlighted text in my notes used to be yellow (even when "Color Inversion" was on). Now, I don't see any color difference between regular text and highlighted text.
(Note, this only happens in "Color Inversion" mode. In regular color mode, there is no problem.)
(...But, as I have very sensitive eyes and therefore am almost always in "Color Inversion" mode, it is a very big problem for me!)
I'm on a Galaxy S9+.
Thanks.