### Godot version

v4.0.beta17.official [c40020513]

### System information

macOS 13.0.1

### Issue description

When a `Control` node is over a `SubViewportContainer` (with a `SubViewport` as a child), both in Full Rect anchors, asking for the get_viewport().get_mouse_position() from a scene inside the `SubViewport` returns (0, 0) as the position of the mouse.

This wasn't happening in at least Beta 15. I was getting the mouse position without any problems before Beta 17. I didn't try Beta 16.

### Steps to reproduce

1. Create a `Control` node
2. Add two children: A `SubViewportContainer` and a `Control` node
3. Put both in Full Rect anchors so the `Control` node (child) is covering the `SubViewportContainer`
4. Ask for the get_viewport().get_mouse_position() from inside a scene of the `SubViewport`

As you can see in this screenshot: asking for the mouse position from inside the `Node2D` script always returns (0, 0).

<img width="1533" alt="SubViewportContainerIssue" src="https://user-images.githubusercontent.com/91340577/217051768-d9c2e8ad-40ca-4c6d-bb98-f6a7c9c6081f.png">

Only If the `Control` (child) mouse filtering is set to _Ignore_ you can get the mouse position. But with that you are losing the mouse inputs from that `Control` node.

You can find the setup of these nodes in the MRP.


### Minimal reproduction project

Run the main scene (control.tscn) and move the mouse around the screen. Look for the print in the Output tab.

[SubViewportMousePositionIssue.zip](https://github.com/godotengine/godot/files/10667894/SubViewportMousePositionIssue.zip)
mb->get_button_index() == MouseButton::WHEEL_RIGHT);
	CanvasItem *ci = p_control;
	while (ci) {
		Control *control = Object::cast_to<Control>(ci);
		if (control) {
			if (control->data.mouse_filter != Control::MOUSE_FILTER_IGNORE) {
				control->_call_gui_input(ev);
			}
			if (!control->is_inside_tree() || control->is_set_as_top_level()) {
				break;
			}
			if (gui.key_event_accepted) {
				stopped = true;
				break;
			}
			if (control->data.mouse_filter == Control::MOUSE_FILTER_STOP && is_pointer_event && !(is_scroll_event && control->data.force_pass_scroll_events)) {
				
				stopped = true;
				break;
			}
		}
		if (ci->is_set_as_top_level()) {
			break;
		}
		ev = ev->xformed_by(ci->get_transform()); 
		ci = ci->get_parent_item();
	}
	return stopped;
}
void Viewport::_gui_call_notification(Control *p_control, int p_what) {