### Godot version

v4.0.beta.custom_build [eaf306e0b]

### System information

Windows 10

### Issue description

Selecting a `Window` node in the Editor's SceneTree results in the message
```
editor/editor_data.cpp:1058 - Parameter "p_node" is null.
```
and the Inspector shows empty content instead of the Window's properties.

I would expect, that clicking on a node in the SceneTree lets me edit the properties of the node.

Bisecting shows that this behavior got introduced in #71770

### Steps to reproduce

1. Create a Window node
2. Click on the Window node in the Editor's SceneTree

### Minimal reproduction project

N/A
if (drag_selection.size() != 1) {
				_commit_canvas_item_state(
						drag_selection,
						vformat(TTR("Rotate %d CanvasItems"), drag_selection.size()),
						true);
			} else {
				_commit_canvas_item_state(
						drag_selection,
						vformat(TTR("Rotate CanvasItem \"%s\" to %d degrees"),
								drag_selection[0]->get_name(),
								Math::rad_to_deg(drag_selection[0]->_edit_get_rotation())),
						true);
			}
			if (key_auto_insert_button->is_pressed()) {
				_insert_animation_keys(false, true, false, true);
			}
			_reset_drag();
			return true;
		}
		
		if (b.is_valid() && b->get_button_index() == MouseButton::RIGHT && b->is_pressed()) {
			_restore_canvas_item_state(drag_selection);
			_reset_drag();
			viewport->queue_redraw();
			return true;
		}
	}
	return false;
}
bool CanvasItemEditor::_gui_input_open_scene_on_double_click(const Ref<InputEvent> &p_event) {