P.S. As I understand it, this is due to the lack of Cantata in the icon sets (Breeze, Qogir…). Can I assign my own icon to the notification window?
P.P.S. I conducted an “experiment” in a virtual Kubuntu. The current version of flatpak Cantata displays the KDE shortcut. The Cantata Ubuntu version (old, 2.5.0) displays the Cantata shortcut. I don’t understand anything