I was busy to fix this problem.
I have fixed this to set the splitter on 1080p instead of 2160p. At 1080p the ambilight works on my ps4 pro and by 2160p it does not. Then I get this colors.
So what I think is that my hdmi2av is not correct. That one is 1080p and should be 2160p.
Does somebody got the 2160p hdmi2av?
Is there maybe someone who could help me?