I've done a bit of messing with this; I need to set Windows Balanced power plan (not Ryzen Balanced) for the vcore to drop on idle as expected. Corsair iCue needs to be closed else the voltage stays high (1.43+). When iCue is closed the voltage drops below 1.0 on idle.
Maybe you also have a monitoring app running that is causing constant boost vcore?
UPDATE
I disabled Icue and after I updated the AMD chipset drivers...No change in vcore for me...1.4 v for me mostly...This is annoying me lol
I paid good money for this chip and I want it to work how it should.