Many videos only play if optical passthrough is enabled

Minor update: I tested the new 7.28.0.15170-beta on my Firestick, and these are my results when trying to play many of my files.
Attempt #1: Default settings (which includes the new player) - The video still refuses to play, but the error is different. Instead of receiving the “Playback has stopped because the connection to the Plex Media Server has been lost” error, I receive the “An error occurred while attempting to play this video. Please try restarting both the Plex Media Server and this app” error. Note: Restarting the client and server doesn’t change anything.
Attempt #2: Default settings with new player, except optical passthrough is enabled - Playback is successful.
Attempt #3: Default settings with old player - I get the old “Playback has stopped because the connection to the Plex Media Server has been lost” error.
Attempt #4: Default settings with old player and optical passthrough enabled: Playback is successful.
The logs for these four attempts, in order with S01E01 of Westworld, are attached.
logging.txt (409.1 KB)