Unable to directplay/stream any 4k HDR videos on either PMP or Plex for Windows

Server Version#: 1.21.0.3616
Player Version#: PMP - 2.58.0.1076
Plex for Windows - 1.23.0.1435

Windows 10 20H2 via HDMI 2.0 to LG CX65 OLED.

I have been able to play these videos without any issues earlier, but i’ve been trying to play them again for over 10 hours now with no success. I have tried reinstalling fresh nvidia drivers, reinstalling both PMP and Plex for Windows. Tried all possible combinations within both app settings to no avail.

At times the transcoding works and playback stats and i see that the audio tracks are also being trancoded and sometimes misrecognized (TrueHD tracks are shown up as trasncoding from Opus 5.1 to 5.1, AC3 5.1 to aac, and random stuff like that) i can and have direct played these files without any issues earlier.

Anyone else facing these issues?

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