Hi, I also have this issue. I have encountered it on Plex and Kodi. the problem with sync on Dolby vision videos is that the color displayed on the bulbs/lamps/strips is just green and magenta. Now if you have a tv or a streaming device that does not support Dolby vision the colors of the video are mismatched, basically the video has only two colors green and magenta. And I think sync receives only this two colors and this is the reason that sync on Dolby vision displays only green and magenta.