Most keys generate different keysyms depending on modifier state, the most prominent example being the shift key. Winit only does these transformations for text input, but some keyboard layouts like Neo put non-character keys like arrow keys on higher layers. Only the unmodified key gets through and the application is sent a KeyboardInput event with virtual keycodes of L,I,A,E in the case of Neo, but no RecievedCharacter event. Correct behaviour would be to send KeyboardInputs for Up, Left, Down, Right keycodes.