### 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)
ERR_FAIL_COND_V(!is_inside_tree(), Rect2());
	Rect2i parent_rect;
	if (is_embedded()) {
		parent_rect = _get_embedder()->get_visible_rect();
	} else {
		const Window *w = is_visible() ? this : get_parent_visible_window();
		
		ERR_FAIL_COND_V(!w, Rect2());
		parent_rect = DisplayServer::get_singleton()->screen_get_usable_rect(DisplayServer::get_singleton()->window_get_current_screen(w->get_window_id()));
	}
	return parent_rect;
}
void Window::add_child_notify(Node *p_child) {
	if (is_inside_tree() && wrap_controls) {
		child_controls_changed();
	}
}
void Window::remove_child_notify(Node *p_child) {
	if (is_inside_tree() && wrap_controls) {
		child_controls_changed();
	}
}
void Window::set_theme_owner_node(Node *p_node) {
	theme_owner->set_owner_node(p_node);
}
Node *Window::get_theme_owner_node() const {
	return theme_owner->get_owner_node();
}
bool Window::has_theme_owner_node() const {