Good that you were able to find the root cause.
Like
@Felix123BU, I was also thinking that this does not sound like 6800XT problem.
Either the motherboard or the PCI-e connector could be an issue.
Sometimes it is just some weird bios issue from mainboard that could be gone if you clear the CMOS.
I had a weird issue myself last weekend when I put together new computer for my son.
On ASUS Crosshair VIII hero mainboard, the CPU fan connector was not detecting the DDC pump and the pump would run at full speed.
I thought it was problem with DDC pump RPM control cable as it was not being detected on any fan port on the mainboard. I took appart the cable plug and pump to check if there is issue with the cable or connection on DDC pcb.
This did not help.
I thought pump RPM circuit was broken and as last resort, I thought let's clear the mainboard bios maybe issue lies there.
To my surprise it was some bios weird issue, after I cleared the CMOS the DDC pump was detected and I could control the speed with AI Suite.
I did not spend much time on my computer in the last days since I came back from trip to India.
I need to check if I can see CPU on matric page with new driver.
What I did notice when I put together all new AMD machine (5800x an 6800XT) for my son is that on Wattman page with 21.9.1 there was a new field to overclock the Ryzen process through Wattman.
It used to have only GPU Ocing there.