
Note that this removes a workaround for malformed content, in which the track_ID is set incorrectly. It's unclear there was sufficient reason to implement that workaround, and so it's preferable to remove it, rather than implementing the concept of unrecognized tracks, which would be needed to keep it and to also fix this issue. Issue: #9056 #minor-release PiperOrigin-RevId: 379506261