Dolby Vision Profile 7 does not work from mkv

Dolby Vision Profile 7 STDL mkv does not work on Ugoos AM6B Plus media player!
The last working version of Plex Media Player that it works with is 9.16.1.38616, which was released in mid-February.
It no longer works with newer versions released since then! Such films are launched in HDR10/HDR10+ version, it does not recognize Dolby Vision!
It starts the mkv DV Profile 8.1 but not the Profile 7.

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