Also experiencing same issue with the new Apple TV 4K 2021 with HDR content. Very noticeable color banding when watching 4k HDR content. Issue does not appear to be present when enabling “use old video player”. Also does not appear to be an issue with the Infuse app.
Model: Apple TV 4K 2021
TV: OLED65CXPUA
Also, I have confirmed that this is not an issue on my older AppleTV 4K (non-2021 model).
