### 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 (x_for_viewport_y >= 0 && x_for_viewport_y <= viewport_size.x) {
			points.push_back(Point2(x_for_viewport_y, viewport_size.y));
		}
	}
	if (points.size() >= 2) {
		RenderingServer::get_singleton()->canvas_item_add_line(ci, points[0], points[1], p_color);
	}
}
void CanvasItemEditor::_draw_axis() {
	if (show_origin) {
		_draw_straight_line(Point2(), Point2(1, 0), get_theme_color(SNAME("axis_x_color"), SNAME("Editor")) * Color(1, 1, 1, 0.75));
		_draw_straight_line(Point2(), Point2(0, 1), get_theme_color(SNAME("axis_y_color"), SNAME("Editor")) * Color(1, 1, 1, 0.75));
	}
	if (show_viewport) {
		RID ci = viewport->get_canvas_item();
		Color area_axis_color = EDITOR_GET("editors/2d/viewport_border_color");
		Size2 screen_size = Size2(GLOBAL_GET("display/window/size/viewport_width"), GLOBAL_GET("display/window/size/viewport_height"));
		Vector2 screen_endpoints[4] = {
			transform.xform(Vector2(0, 0)),
			transform.xform(Vector2(screen_size.width, 0)),
			transform.xform(Vector2(screen_size.width, screen_size.height)),
			transform.xform(Vector2(0, screen_size.height))
		};
		for (int i = 0; i < 4; i++) {
			RenderingServer::get_singleton()->canvas_item_add_line(ci, screen_endpoints[i], screen_endpoints[(i + 1) % 4], area_axis_color);
		}
	}
}
void CanvasItemEditor::_draw_invisible_nodes_positions(Node *p_node, const Transform2D &p_parent_xform, const Transform2D &p_canvas_xform) {