So no doubt your TV set is also able to play the DolbyVision content with Kodi?
I have a mediaplayer which is capable of playing DolbyVision content but my 4k LG HDR10 projector isn't.
The shield tv mediaplayer doesn't indicate it is a Dolby Vision ready device.
On a tv set which is capable it does.
I am using for now only my PC, to exclude any solo4k or TV issues, the sample provided earlier do not work well on my PC either, but the samples from Kodi works well on my PC.