I discussed the problem here: https://community.amd.com/thread/249584
Some more people reported similar problems there. I filed a bug ticket about two driver revisions ago - it seems that no one really cares at amd, since most modern games have their own built in control settings and not many people play older games that don't. Therefore the problem is not 'popular' and probably will never be solved.
Personally I use my PC for many oldschool games. None of them seem to accept Adrenalin 2020 settings (AA, AF, vsync override).
Current drivers are even supposed to not offer such options 'by design' for any games other than DX9 games - but this also seem not to be true (I cannot force anisotropic filtering in DX9 game - TES IV Oblivion).
I don't understand why newer products have features being removed - things worked fine in my older RX 570 with previous drivers (now I have RX5600XT and cant revert to any pre 2020 drivers).
What I can recommend is to go green team with the next upgrade.