So passthrough HDR worked perfectly fine up to about a week ago on my Yamaha RX-V6A, now it looks all washed out. Setting it to Auto seems to produce a better image but I suspect it’s just SDR.
Your Yamaha is not passing through HDR capabilities (or even deep colour) from your TV. It seems you’ve had issues with EDID reading in the past since you have a disp_cap file. Do you have more than one display like @Adam1V or some other special set-up that’s causing the EDID to be lost on it’s way from your display?
No need for new logs just for that but we need to find out why you’re not getting the full EDID. Can you try different HDMI cables and/or clean the contacts?