### 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)
Window *get_parent_visible_window() const;
	Viewport *get_parent_viewport() const;
	void popup(const Rect2i &p_rect = Rect2i());
	void popup_on_parent(const Rect2i &p_parent_rect);
	void popup_centered_ratio(float p_ratio = 0.8);
	void popup_centered(const Size2i &p_minsize = Size2i());
	void popup_centered_clamped(const Size2i &p_size = Size2i(), float p_fallback_ratio = 0.75);
	Size2 get_contents_minimum_size() const;
	void grab_focus();
	bool has_focus() const;
	void set_layout_direction(LayoutDirection p_direction);
	LayoutDirection get_layout_direction() const;
	bool is_layout_rtl() const;
	void set_auto_translate(bool p_enable);
	bool is_auto_translating() const;
	_FORCE_INLINE_ String atr(const String p_string) const { return is_auto_translating() ? tr(p_string) : p_string; };
	Rect2i get_usable_parent_rect() const;