Playback & video editor don't work while workflow is running

Steps to reproduce:
1. Go to Recordings->Events
2. Click on 'Add Event' and create an Event by uploaded a short video file
3. Wait until the "Eye"-Icon appears in the Event listing

Actual Results:
After the workflow has published the video editor preview (but it is still running), the eye-icon to launch the playback & video editor tools is displayed. When the user clicks it while the workflow is still running, the corresponding tools do open but don't work, i.e. no video is shown

Expected Results:
Whenever the Eye-Icons is displayed, the playback & video editor tools should work, i.e. shown the video

Workaround (if any):