### 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)
void update_mouse_cursor_shape();
	void show();
	void hide();
	void set_transient(bool p_transient);
	bool is_transient() const;
	void set_exclusive(bool p_exclusive);
	bool is_exclusive() const;
	void set_clamp_to_embedder(bool p_enable);
	bool is_clamped_to_embedder() const;
	bool is_in_edited_scene_root() const;
	bool can_draw() const;
	void set_ime_active(bool p_active);
	void set_ime_position(const Point2i &p_pos);
	bool is_embedded() const;
	void set_content_scale_size(const Size2i &p_size);
	Size2i get_content_scale_size() const;
	void set_content_scale_mode(ContentScaleMode p_mode);
	ContentScaleMode get_content_scale_mode() const;
	void set_content_scale_aspect(ContentScaleAspect p_aspect);
	ContentScaleAspect get_content_scale_aspect() const;
	void set_content_scale_factor(real_t p_factor);
	real_t get_content_scale_factor() const;
	void set_use_font_oversampling(bool p_oversampling);
	bool is_using_font_oversampling() const;
	void set_mouse_passthrough_polygon(const Vector<Vector2> &p_region);
	Vector<Vector2> get_mouse_passthrough_polygon() const;
	void set_wrap_controls(bool p_enable);
	bool is_wrapping_controls() const;
	void child_controls_changed();
	Window *get_exclusive_child() const { return exclusive_child; };