### 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)
_propagate_window_notification(this, NOTIFICATION_WM_CLOSE_REQUEST);
			emit_signal(SNAME("close_requested"));
		} break;
		case DisplayServer::WINDOW_EVENT_GO_BACK_REQUEST: {
			_propagate_window_notification(this, NOTIFICATION_WM_GO_BACK_REQUEST);
			emit_signal(SNAME("go_back_requested"));
		} break;
		case DisplayServer::WINDOW_EVENT_DPI_CHANGE: {
			_update_viewport_size();
			_propagate_window_notification(this, NOTIFICATION_WM_DPI_CHANGE);
			emit_signal(SNAME("dpi_changed"));
		} break;
		case DisplayServer::WINDOW_EVENT_TITLEBAR_CHANGE: {
			emit_signal(SNAME("titlebar_changed"));
		} break;
	}
}
void Window::update_mouse_cursor_shape() {
	
	
	Ref<InputEventMouseMotion> mm;
	Vector2 pos = get_mouse_position();
	Transform2D xform = get_global_canvas_transform().affine_inverse();
	mm.instantiate();
	mm->set_position(pos);
	mm->set_global_position(xform.xform(pos));
	mm->set_device(InputEvent::DEVICE_ID_INTERNAL);
	push_input(mm);
}
void Window::show() {