I have a simple login form with email and password input fields next to each other. Now I set up 2 input axes called UI Horizontal and UI Vertical and set them as navigation axes in the Event System. The UI Vertical includes Down Arrow as well as Tab key. While the UI navigation seems to work with buttons it doesn't seem to work with input fields. When I press Up, Down or Tab on a single-line input field it doesn't switch the focus. How could I achieve the expected behavior? Is this a bug with input fields?