I haven't seen any info about this being a known issue in the release notes, but I have existing code for receiving play and pause events via MPRemoteCommandCenter that works fine on previous versions of tvOS; whereas on the tvOS 14 beta none of the commands are firing events in response to the Apple TV remote.
I am seeing this error in the console when pressing pause on the remote:
[NowPlaying] [MRPlaybackQueueServiceClient] Responded to playbackQueueRequest [...] with error Operation requires a client callback to have been registered.
I am seeing this error in the console when pressing pause on the remote:
[NowPlaying] [MRPlaybackQueueServiceClient] Responded to playbackQueueRequest [...] with error Operation requires a client callback to have been registered.