Updated to Kubuntu 24.04 and therefore KDE Plasma 5.27.11. Since the update, non-KDE apps such as Mullvad, Telegram, and KeePassXC no longer show in the system tray. Has anyone experienced this issue? Just spent the last two hours looking through various old (similar) threads and tried many potential fixes to no avail. Perhaps it is a bug in 24.04 or KDE. I did delete my ~./config folder and the issue persisted.
I can’t say for sure for the applications you mentioned, but I have the same problem with virt-manager on the Wayland session.
When using wayland session, you need to have an “appindicator listener” installed, which works with the panel and supports those applications.
Maybe someone can share their appindicator listener of choice here.
Telegram, Skype and all similar apps do not have icons in fresh Kubuntu 24.04. First surprise on fresh OS. Looks like it’s related to snap applications.