I install the last driver updates 20.11.2 and chipset update for my HP 360 envy with Ryzen 5 4000 series and AMD RADEON GRAPHICS and Windows Update still downgrade my driversversions to last Version 20.09.1.
I am not really sure what exactly could be causing that. I haven't seen anyone else have that problem as the latest update loaded onto both of my Ryzen mobile systems fine.