Until a few weeks ago when I used Google Play Music Desktop Played it would show up on the Media Player Controller widget on the Plasma Desktop however, now, it is no longer detected. I tested this on two machines with the same results. MPV also is not detected but VLC, Gwenview, Rhythmbox and SMPlayer all are detected as normal.
I tried rebuilding GPMDP but it still isn't seen by the widget. I haven't seen this reported anywhere else so wondering if it is a Solus issue. Not sure how to debug the widget though. Can anyone else verify this?