### 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)
if (p_property.name == "position" && initial_position != WINDOW_INITIAL_POSITION_ABSOLUTE) {
		p_property.usage = PROPERTY_USAGE_NONE;
	}
	if (p_property.name == "current_screen" && initial_position != WINDOW_INITIAL_POSITION_CENTER_OTHER_SCREEN) {
		p_property.usage = PROPERTY_USAGE_NONE;
	}
	if (p_property.name == "theme_type_variation") {
		List<StringName> names;
		
		
		ThemeDB::get_singleton()->get_default_theme()->get_type_variation_list(get_class_name(), &names);
		if (ThemeDB::get_singleton()->get_project_theme().is_valid()) {
			ThemeDB::get_singleton()->get_project_theme()->get_type_variation_list(get_class_name(), &names);
		}
		names.sort_custom<StringName::AlphCompare>();
		Vector<StringName> unique_names;
		String hint_string;
		for (const StringName &E : names) {
			
			if (unique_names.has(E)) {
				continue;
			}
			hint_string += String(E) + ",";
			unique_names.append(E);
		}
		p_property.hint_string = hint_string;
	}
}
void Window::set_title(const String &p_title) {