No idea if I am really of much help since all applications crash after a while in my case
( [560.35.03] Crash on Optimus Laptop when external Monitor uses more than 60 Hz )
But I faced this issue until 555.58 and it is resolved with 570.86.16.
HDR worked as well so no need to set hdmi_deepcolor=0
My device is an laptop ( I tested in dGPU only mode as well just to be sure ) with an GeForce RTX 4080 Max-Q / Mobile