I finally received the Dolby Vision firmware update for my Sony X9300E in Hong Kong.
My Apple TV 4K supports Dolby Vision and it is connected to my Sony HT-Z9F Soundbar (and my soundbar is connect to HDMI 3 from the X9300E).
MY Apple TV 4K was set to Dolby Vision 4K 60hz and when I played any video on Netflix from my Apple TV I could see any video. It is only when I restart my Apple TV 4K and then go back to netflix I am able to see the video. I found that this is a problem with many people as it is reported at the Apple community forums.
Anyway, I also noticed that while the video is playing I can see bits of static on the video. However, when I change the display settings in Apple TV 4K from 4K Dolby Vision 60hz to 4K SDR 60hz and set match content to on for both settings. This problem goes away.
Is this what you all are setting also for your Apple TV 4K?
This static is only noticeable on the Apple TV 4K videos and not on any other video from other devices.