First of all thanks for the update.
Now to my story. I've had an issue with the system tray since starting using Solus Budgie: icons from remote applications launched via Citrix Workspace (previously Receiver) appear in black square boxes, wich is visible if the taskbar is transparent, and some of them overlap with another, but after the last update (not sure, but I suppose so), icon from wine application (Radmin Viewer) also has this black box.
I can totally live with it, just for your information π