MKV files added to PMS after 1.19.3.2852 update, can't be played with REMOTE Web Player - CPU error is shown

It doesn’t appear as though debug logging has been enabled. Make sure you’re enabling it in the server settings (Settings -> (Settings) General) and not the web client settings (Settings -> (Plex Web) -> Debug).

And it still doesn’t look like deep analysis has been performed on your media. To ensure it happens automatically during scheduled tasks, to to Settings -> Scheduled Tasks and make sure the following option is enabled:
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To force deep analysis now, run Plex Media Scanner:

  1. Run Plex Media Scanner -l and note the ID of the library having issues.
  2. Run Plex Media Scanner -c ID --analyze-deeply; replace “ID” with the ID from step 1.

If you’re on Linux, FreeBSD, or a Mac, then additional environment information will have to be passed.

[Edit to correct]
As @Volts points out below the command above, as provided, won’t actually cause deep analysis to be performed on the library. You’ll need to have it run analysis on individual items. Volts provides a corrected command below:

You’ll still need to set the environment correctly for it to work.

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