3rd party oc/fan control apps can conflict with wattman, use one or the other.
To disable wattman, in radeon settings > preferences > restore factory defaults.
But it could be a card vbios/fan controller fault, best to contact XFX support as they may offer a solution.
My PC- Ryzen 5 5600x, B550 aorus pro ac, Hyper 212 black, 2 x 16gb F4-3600c16dgtzn kit, NM790 2TB, Nitro+RX6900XT, RM850, Win.10 Pro., LC27G55T.