You've actually answered your own question, kinda, sorta. The only time I have had those double-tones is when I'm running a beta version, once something goes to the release candidate or actual release version those disappear.
I have to believe this is an intentional design element so that one knows that a beta is in use.
Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042
The depths of denial one can be pushed to by outside forces of disapproval can make you not even recognize yourself to yourself.
~ Brian Vogel