title: How to update playback position in control center?
body: <p>This is how I observe changes from command center:</p>
  <pre><code>    commandCenter.playCommand.addTarget(self, action: #selector(play))
      commandCenter.pauseCommand.addTarget(self, action: #selector(pause))
      commandCenter.changePlaybackPositionCommand.addTarget { event in
          let seconds = (event as? MPChangePlaybackPositionCommandEvent)?.positionTime ?? 0
          let time = CMTime(seconds: seconds, preferredTimescale: 1)
          self.player.seek(to: time)
          return .success
      }
  </code></pre>
  <p>When I change position of slider, my app receives callback and position of audio is updated, but... position of slider in control center brings back to the previous state. Why?</p>
  <p>The question is:</p>
  <p><strong>Why it doesn't stay where I left the finger, instead of getting back to the previous position?</strong></p>