### 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)
WindowInitialPosition initial_position = WINDOW_INITIAL_POSITION_ABSOLUTE;
	bool use_font_oversampling = false;
	bool transient = false;
	bool exclusive = false;
	bool wrap_controls = false;
	bool updating_child_controls = false;
	bool updating_embedded_window = false;
	bool clamp_to_embedder = false;
	LayoutDirection layout_dir = LAYOUT_DIRECTION_INHERITED;
	bool auto_translate = true;
	void _update_child_controls();
	void _update_embedded_window();
	Size2i content_scale_size;
	ContentScaleMode content_scale_mode = CONTENT_SCALE_MODE_DISABLED;
	ContentScaleAspect content_scale_aspect = CONTENT_SCALE_ASPECT_IGNORE;
	real_t content_scale_factor = 1.0;
	void _make_window();
	void _clear_window();
	void _update_from_window();
	void _update_viewport_size();
	void _update_window_size();
	void _propagate_window_notification(Node *p_node, int p_notification);
	void _update_window_callbacks();
	void _clear_transient();
	void _make_transient();
	Window *transient_parent = nullptr;
	Window *exclusive_child = nullptr;
	HashSet<Window *> transient_children;
	ThemeOwner *theme_owner = nullptr;
	Ref<Theme> theme;