Hi, do you have any update on the outcome?
I also noticed the behavior of fans not spinning on my 5600 xt which was very strange to me.
From what I could gather online etc. is that there is this 0 RPM mode aimed at making the cards run more silent.
Fans will only initiate once the card reaches a certain temp, there are some settings in the Adrenalin software where you can switch off this 0 RPM feature and set your own fan curve settings etc.