[BUG] HEVC 4K transcoding instead of DirectStream (updated ) - please fix

I can confirm that after latest update experience of 4K HDR is completely destroyed. 1080p HEVC is also broken. State is such that HEVC support degraded significantly.
Plex version: 2.15.2.70
OS version: 17733.2001 rs5 1810.180807-1920

Container MKV contains multiple audio tracks and 1 sub track.

Here is what happens with following selection 4K HEVC HDR + AC3 audio track - no subs:

  • In DirectPlay Mode instead of buffering message after 40sec now buffering occurs about 8 times/sec. Previously it was similar to DirectStream mode, which was logical, now it is different, not sure why. After 40sec connection to Plex Server is lost. Plex Server is still running.
  • In DirectStream mode buffering message appears after 40sec.
    Note: 40sec is dependent on specific movie. On others problem may appear after 20sec.

Here is what happens on with 4K HEVC HDR + DTS audio track - no subs:

  • (DirectStream mode available only) buffering message appears after 40sec.

Scenario: Container MP4 contains 1 audio AC3 track. Work as intended. Playback without interruptions.

Other scenarios:
1080p HEVC SDR + DTS - broken. Buffering/stuttering issues. Previously worked fine.
1080p HEVC SDR + FLAC 5.1 - broken. Buffering/stuttering issues. Previously worked fine.
1080p SDR - works as intended.