There’s a bug that causes artifact to build up on panel icons over time, causing them to become illegible. The bug has been in evidence since I started using Ubuntu Budgie in 18.04 and has persisted in 20.04.
The bug manifests as icons in the system tray becoming more and more distorted due to artifact that builds up from every change of image. Network manager and calendar notification icons are affected first. Eventually, all system tray icons will also become distorted. The buildup of artifact isn’t limited to the system tray area. Adjacent icons to the system tray can be covered by system tray artifact when the tray changes size due to the appearance and disappearance of tray icons.
Shown is the Network manager starting to get messed up from this bug.
This doesn’t affect the functionality of the item, only its appearance. Text display in the panel and system tray is not affected by this bug.
run in the terminal restores the appearance of the panel and mutes the effect of this bug for the duration of the session. Momentarily changing the location of the panel in settings also mutes the bug for the session. Adding the command as a startup item mutes the effect of the artifact bug automatically.
I’m not a developer, but I’ve been using various flavors of Unix and Linux since the 90’s