Summary: Icon of Media Player applet is missing in the System Tray settings when the media playing has a cover. Such icon is present when nothing is playing. Fix by not using album art in any case - icon is not longer used in tooltip, can be static.
- play audio/video with a player compatible with Media Player applet
- open system tray settings during playback
- Icon of Media Player applet is always present in system tray settings, regardless of state.