So I have after almost giving up, jumped in again and then in order to get 4K HDR I have to set my HDMI splitter to copy (FeinTech VSP01201 HDMI 2.0)
So everything works perfectly when I watch a movie or trigger something that will display in 4K HDR. Then colors are great, picture is great and lights are great.
However in the normal screen I see this : https://imgur.com/a/Y6xBW1c
I don't have this problem if I set the apple tv to 4K SDR, but I really want the HDR quality.
EDIT: I see my tv mode is 4k Dolby VIsion, if I try to set it to 4K HDR then it doesn't show any colors
Anyone know a solution for this?