### 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)
StringName theme_type_variation;
	bool bulk_theme_override = false;
	Theme::ThemeIconMap theme_icon_override;
	Theme::ThemeStyleMap theme_style_override;
	Theme::ThemeFontMap theme_font_override;
	Theme::ThemeFontSizeMap theme_font_size_override;
	Theme::ThemeColorMap theme_color_override;
	Theme::ThemeConstantMap theme_constant_override;
	mutable HashMap<StringName, Theme::ThemeIconMap> theme_icon_cache;
	mutable HashMap<StringName, Theme::ThemeStyleMap> theme_style_cache;
	mutable HashMap<StringName, Theme::ThemeFontMap> theme_font_cache;
	mutable HashMap<StringName, Theme::ThemeFontSizeMap> theme_font_size_cache;
	mutable HashMap<StringName, Theme::ThemeColorMap> theme_color_cache;
	mutable HashMap<StringName, Theme::ThemeConstantMap> theme_constant_cache;
	void _theme_changed();
	void _notify_theme_override_changed();
	void _invalidate_theme_cache();
	Viewport *embedder = nullptr;
	Transform2D window_transform;
	friend class Viewport; 
	void _window_input(const Ref<InputEvent> &p_ev);
	void _window_input_text(const String &p_text);
	void _window_drop_files(const Vector<String> &p_files);
	void _rect_changed_callback(const Rect2i &p_callback);
	void _event_callback(DisplayServer::WindowEvent p_event);
	virtual bool _can_consume_input_events() const override;
	Ref<Shortcut> debugger_stop_shortcut;
protected:
	Viewport *_get_embedder() const;
	virtual Rect2i _popup_adjust_rect() const { return Rect2i(); }