Why isn't onCaptureOverlayStateChanged called for states other than "shown" and "stopped"?

Question

What I do is pretty straight forward. I have a class which implements Videos.CaptureOverlayStateListener. When the Google API client is connected, I call Games.Videos.registerCaptureOverlayStateChangedListener for this class. Then I have a simple log call inside its onCaptureOverlayStateChanged method.

Then I manually show the capture overlay like this:

public void showRecordingOverlay() {
    Intent intent = Games.Videos.getCaptureOverlayIntent(this.apiClient);
    this.activity.startActivityForResult(intent, 777);
}

... and record a short video.

onCaptureOverlayStateChanged gets called only with CAPTURE_OVERLAY_STATE_SHOWN and CAPTURE_OVERLAY_STATE_CAPTURE_STOPPED.

Even though I (obviously) start the video recording and eventually close the overlay (by dragging it to the X in the center of the screen), CAPTURE_OVERLAY_STATE_CAPTURE_STARTED and CAPTURE_OVERLAY_STATE_DISMISSED never seem to be sent.

So... why does this happen? Do I need to do something special for these notifications?