That is with passthrough = HDMI, correct?
I believe this will be fixed in the Plex Android TV 8.29 release, currently in beta.
The topic is discussed in this thread.
If I’m reading the comments correctly, TrueHD will be transcoded to AC3 5.1 or EAC3 5.1 instead of Opus. PCM 7.1 will be transcoded, but should also end up as 5.1 not stereo (I’m not sure to which format it will be converted. I may have missed it in the thread).
It is unknown when 8.29 will go mainstream. Plex never gives out release schedules and a problem could always crop up and delay things.
You may want to stay with passthrough = optical in the meantime, as that forces the TrueHD to AC3 transcode, and AC3 and DTS still passthrough.
You can join the beta program if desired. You’ll receive faster updates (see schedules below). The releases are generally stable, but the purpose of a beta release is to test new features and fixes before they go mainstream, so things do break and there are sometimes weird bugs that crop up.
If you want to try a beta build without signing up for beta releases you may be able to sideload the app. You can download the APK from the release announcement. I’ve sideloaded on a Nvidia Shield and Amazon FireStick. Never tried it on a Sony TV, but it should work. The process is straightforward. You can google “Android TV sideload” or similar terms to get instructions. I used the Downloader app, but there are many other options.
