Video Through Receiver Broken After the Big Update | One S 4k HDR

I can verify this issue...Netflix UHD does not work on Xbox One S. I have a Vizio M55-D0 with the latest firmware enabling HD10 support. My TV is now recognized by the One S video settings as 4K HDR capable. I am able to enable HDR support and it works beautifully
with the Blu-Ray app (Mad Max 4K Blu Ray playing 4K, 24fps, HDR as verified by the Vizio settings app). However when I start Netflix, the screen flashes, colors mute, and video fails to switch to HDR or 24fps. Netflix app is clearly broken right now for HDR.
If I switch HDR off on the One S, Netflix app is fine, plays 4K correctly, colors are fine obviously no HDR.

My TV doesn't support HDR at all but it is 4k capable. I have tried having the XBOX One S directly connected to the TV and through the receiver with no luck getting anything 4k out of the One S.

Unfortunately after checking multiple sources it seems that the YouTube app on the One S does not currently support 4K. The One X app received an update on Dec 11, 2017 which allows 4k content (HDR not included) but the app for One S is still in development.
Sorry for the confusion. Even I had to do a little research.

The big one is HDR format. There are two Dolby Vision and HDR10. Xbox One S only supports HDR10 for now.

If you need more details, check here

support.xbox.com/.../troubleshooting-4K-and-HDR-on-xbox-one-s

Plenty of threads I've seen with people driving the Xbox One S's 4K output through a receiver is often due to the receiver being at fault, because the receiver's specifications for various HDMI features (4K, HDR, 60Hz, etc) are often minimal, if not outdated.

With the above being the case, the Xbox One S will be checking the "4K TV details" criteria against the receiver itself, not the TV.

As Sho K1lla mentioned, it is best to connect your Xbox directly to your TV. Your Samsung KS8000 should support HDR10, which is the type of HDR profile that the Xbox One S uses.