If you install Mattermost on Manjaro via pacman/AUR — not Snap; the Snap build does not hit this — do not enable “Start app on login” in Mattermost’s own settings.
Turn that off. Keep “Launch minimized” and “Show icon in tray”. Then add Mattermost to autostart manually from Manjaro/KDE system settings (Session and Startup → Autostart).
Why: a years-old bug, still open. Mattermost’s built-in autostart writes ~/.config/autostart/electron.desktop and launches plain Electron on login — not Mattermost. You get a Electron window instead of the client.
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