I'm having a very similar issue since 16.4 beta 2 with hue sync. I get dolby vision video fine but no light sync with the dolby vision support on the hue disabled. If I enable enhanced dolby vision support on the hue I get lightsync but no video. HDR works fine. Hoping this is fixed in the next beta or GA release
patrickrowan
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update: not fixed in beta 3 for me
the latest 16.4 update released today fixed this issue for me