Plex 5.4.1 broke passthrough on Shield TV (2015) NVIDIA 5.0.2
After upgrading the Shield TV to NVIDIA experience 5.0.2, Plex updated to 5.4.0 and worked great. After updating to 5.4.1 passthrough audio stopped working. I uninstalled all updates and the version that shipped with 5.0.2 worked. I downloaded 5.4.0 and sideloaded it and that works great. Then I manually updated to 5.4.1 available on the Google Play store, and passthrough was broken again.
I uninstalled all updates and sideloaded 5.4.0 again and audio is back to working.