That is because with AMD drivers it does not work how it is supposed to work.
As mentioned I tested variuos VR headsets with my 2080 ti and a 6900xt, which I sent back because it was smoother with the Nvidia just because Motion Smoothing worked correctly only with the Nvidia cards. Only the 21.5.2 drivers (may 2021) worked correctly in VR. But I decided to send back the card and keep my 2080ti as I cannot fly without Motion Reprojection. Because no machine in the world can deliver 90fps in VR with complex Flight Simulators like DCS and FS2020.
I also sold my VR headset because of this, but I keep always an eye to returning to VR but I need both a good card and a good headset.
Anyway back in topic, I see that AMD still has not solved its VR issues with reprojection technologies.
Too bad because their card are solid ones.