So the problem is not the TV ? ok ...
I'm not saying that. In your case it might be. The reports in this thread appear to relate to LG TVs specifically.
There appear to be several HDR / colorspace type problems which may or may not be related to specific TV brands. They may be a bug in HiMedia firmware or they may be a bug in TV firmware. I want HiMedia to test the firmware better against many combinations of TVs and settings.
HDR at the moment is a tricky thing to get right. If you visit Shield, Xbox, and all HDR TV brand forums you'll find confusion reigns over what works and how to get it working.