Preview uncompressed RGB source doesn't work

[serg]

No clue why 'LWLibavSource' is still used on your end.
You wrote that you did not disable 'Filtering->Vapoursynth->Misc->Input->Prefer LSMASHSource over LWLibAVSource for mp4/mov' thus Hybrid should use LSMASHSource.
No clue,..
-> I'll create a version which will create additional debug output to see what's happening.

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I also remuxed the file (https://drive.google.com/file/d/1_eJz7xS...sp=sharing) and the remuxed version works fine here with LWLibAVSource.

Cu Selur

I checked 'Filtering->Vapoursynth->Misc->Input->Prefer LSMASHSource over LWLibAVSource for mp4/mov' - it's enabled (checked box)