Seems like at least one made it RGB 10bits which is superior. Note: connecting through an AV receiver might further complicate things, you are actually interacting with the EDID of the receiver then.Today, I tried with both my 2021 16" base model MBP, and my 2022 base Mac Studio with M1 Max.
Same YCBCR 4:2:2 8b 4L10 for both. Isn't this the most/best we can expect?