### 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)
bool is_using_occlusion_culling() const;
	Vector2 get_camera_coords(const Vector2 &p_viewport_coords) const;
	Vector2 get_camera_rect_size() const;
	void push_text_input(const String &p_text);
	void push_input(const Ref<InputEvent> &p_event, bool p_local_coords = false);
	void push_unhandled_input(const Ref<InputEvent> &p_event, bool p_local_coords = false);
	void set_disable_input(bool p_disable);
	bool is_input_disabled() const;
	Vector2 get_mouse_position() const;
	void warp_mouse(const Vector2 &p_position);
	void set_physics_object_picking(bool p_enable);
	bool get_physics_object_picking();
	void set_physics_object_picking_sort(bool p_enable);
	bool get_physics_object_picking_sort();
	Variant gui_get_drag_data() const;
	void gui_reset_canvas_sort_index();
	int gui_get_canvas_sort_index();
	void gui_release_focus();
	Control *gui_get_focus_owner();
	PackedStringArray get_configuration_warnings() const override;
	void set_debug_draw(DebugDraw p_debug_draw);
	DebugDraw get_debug_draw() const;
	int get_render_info(RenderInfoType p_type, RenderInfo p_info);
	void set_snap_controls_to_pixels(bool p_enable);
	bool is_snap_controls_to_pixels_enabled() const;
	void set_snap_2d_transforms_to_pixel(bool p_enable);
	bool is_snap_2d_transforms_to_pixel_enabled() const;
	void set_snap_2d_vertices_to_pixel(bool p_enable);
	bool is_snap_2d_vertices_to_pixel_enabled() const;
	void set_input_as_handled();