### Godot version

 Latest 4.0.dev (a3a42159e31db27f8ae7c1ecad6a9ed417cb05de)

### System information

Ubuntu 22.04.1 LTS

### Issue description

![image](https://user-images.githubusercontent.com/85438892/214476911-0ce83a43-b959-4b13-88fd-d6b9af0cd63a.png)

### Steps to reproduce

Open any script

### Minimal reproduction project

N/A
if (keycode == Key::NONE) {
					keycode = (Key)physical_keycode;
				}
				_get_key_modifier_state(xkeyevent->state, k);
				k->set_window_id(p_window);
				k->set_pressed(keypress);
				k->set_keycode(keycode);
				k->set_physical_keycode(physical_keycode);
				if (!keysym.is_empty()) {
					k->set_key_label(fix_key_label(keysym[0], keycode));
				} else {
					k->set_key_label(keycode);
				}
				if (keypress) {
					k->set_unicode(fix_unicode(tmp[i]));
				}
				k->set_echo(false);
				if (k->get_keycode() == Key::BACKTAB) {
					
					k->set_keycode(Key::TAB);
					k->set_physical_keycode(Key::TAB);
					k->set_shift_pressed(true);
				}
				Input::get_singleton()->parse_input_event(k);
			}
			memfree(utf8string);
			return;
		}
		memfree(utf8string);
#else