### 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(!is_inside_tree());
	ERR_FAIL_COND_MSG(window_id == DisplayServer::MAIN_WINDOW_ID, "Can't popup the main window.");
	ERR_FAIL_COND_MSG(p_ratio <= 0.0 || p_ratio > 1.0, "Ratio must be between 0.0 and 1.0!");
	Rect2 parent_rect;
	if (is_embedded()) {
		parent_rect = _get_embedder()->get_visible_rect();
	} else {
		DisplayServer::WindowID parent_id = get_parent_visible_window()->get_window_id();
		int parent_screen = DisplayServer::get_singleton()->window_get_current_screen(parent_id);
		parent_rect.position = DisplayServer::get_singleton()->screen_get_position(parent_screen);
		parent_rect.size = DisplayServer::get_singleton()->screen_get_size(parent_screen);
	}
	Rect2i popup_rect;
	if (parent_rect != Rect2()) {
		popup_rect.size = parent_rect.size * p_ratio;
		popup_rect.position = parent_rect.position + (parent_rect.size - popup_rect.size) / 2;
	}
	popup(popup_rect);
}
void Window::popup(const Rect2i &p_screen_rect) {