Steps to reproduce:
1. Play a video in the Tools section (Editor i.e.) or in the Assets -> Media section.
2. Do not reload the Admin UI, and navigate to another video in the Assets or in the Tools and press play. You will sometimes hear the audio of the last video played. Sometimes the video is not even playing from the start.
The previous video is still in the scope and will be played
The current video will be played
Workaround (if any):
reload the Admin UI