My usage case is playing on Plexamp iOS and sometimes casting to Plex Appletv. I have noticed the following bugs:
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while playing music on my iPhone, I initiate casting to Plex on my appletv. Streaming does not seem to commence. I have silence on both devices. The appletv displays the correct artwork and track info, but the “play” button on my phone just shows the spinning wheel indefinitely. The only way I can get a successful connection is to skip to the next song. Playback works fine thereafter. Switching casting back and forth between the phone and appletv works fine for a while thereafter. The issue seems to be with the initial connection.
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while casting from my iPhone to the appletv, selecting another track from the same currently playing album via my phone actually selects a different track from the album. Selecting a different track via the appletv works correctly as does selecting when not casting.
Not sure if these bugs apply to any other devices or usage cases.
Hope this helps