I need more information to reproduce. - Which locale and keyboard layout do you use? - Which KDE session do you use? X11, Wayland, Full wayland? - How do you start input method? (Do you set environment variables?) - If you don't use Full wayland session + What happens if remove "Input method panel" widget from your KDE panel and restart? - What will be printed on Konsole by running the following command + $ ibus exit + $ ibus-daemon -vx + switching to ibus-anthy