In the grub options you are sure you selected the one with kernel 6.1 ?
On my side didn’t make progress for the IGPU passthrough and the occasional issues with ethernet/wifi.
Currently I am … testing my gpu passthrough with a lot of cyberpunk 
But after, need to try that AMD iGPU passthrough attempt - #24 by yann , seems interesting. Also need to find a way to dump the ROM of the IGPU and ethernet card.