I did more research with notify-osd. rythmbox actually sends 2 notification requests with embedded icon data, and the second one contains the cover art. I have re-opened bug #229197 that was mentioning that issue in rhythmbox.
I did more research with notify-osd. rythmbox actually sends 2 notification requests with embedded icon data, and the second one contains the cover art. I have re-opened bug #229197 that was mentioning that issue in rhythmbox.