Black crush issue, colour fading specially back colour

[amithkumarbg]

See black colour change in this video, then man wearing black t-shirt his colour change and this happens past few months and even service center can't find the issue what happening

[cheshta]

balck is love

[amithkumarbg]

me too but what I am trying to show your eyes can't see I think friend

[Aswintvm]

same issue on my s9 plus

[aditya27]

same issue on my s8 after November security update