Chrome Sender: media.playerState is not properly updated

Question

I'm working on Chrome Sender application now and noticed that media.playerState was not properly updated to chrome.cast.media.PlayerState.PLAYING when play request is successfully executed. I understand that it's possible to subscribe to media state update via media.addUpdateListener(onMediaUpdate); but it's not very convenient. Are there any plans to make API more consistent?

/**
 * @param {chrome.cast.media.Media} media
 * @return {Promise.defer}
 */
function playMedia(media) {
  let playDefer = Promise.defer();
  let playRequest = new chrome.cast.media.PlayRequest();

  media.play(playRequest, onPlaySuccess.bind(null, playDefer, media), onPlayError); 

  return playDefer;
}

/**
 * @param {Promise.defer} defer
 * @param {chrome.cast.media.Media} media
 */
function onPlaySuccess(defer, media) {
  // Actually `media.playerState` is still chrome.cast.media.PlayerState.PAUSED
  // Is it expected behaviour? 
  console.log('play request success', media.playerState === chrome.cast.media.PlayerState.PLAYING);
  defer.resolve(media);
}

/**
 * @param {chrome.cast.Error} error
 */
function onPlayError(error) {
  console.log(error.code, error.description);
}