From the screenshot, it looks like that dialog is for setting the display language, not the keyboard layout. Also, the indicator is the IBus one, and since the display language is set to Dutch, it translates the "German - Belgian" keyboard layout as "Duits - Belgian". So I don't think this is a bug tbh.
From the screenshot, it looks like that dialog is for setting the display language, not the keyboard layout. Also, the indicator is the IBus one, and since the display language is set to Dutch, it translates the "German - Belgian" keyboard layout as "Duits - Belgian". So I don't think this is a bug tbh.