### 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)
content_scale_mode = p_mode;
	_update_viewport_size();
}
Window::ContentScaleMode Window::get_content_scale_mode() const {
	return content_scale_mode;
}
void Window::set_content_scale_aspect(ContentScaleAspect p_aspect) {
	content_scale_aspect = p_aspect;
	_update_viewport_size();
}
Window::ContentScaleAspect Window::get_content_scale_aspect() const {
	return content_scale_aspect;
}
void Window::set_content_scale_factor(real_t p_factor) {
	ERR_FAIL_COND(p_factor <= 0);
	content_scale_factor = p_factor;
	_update_viewport_size();
}
real_t Window::get_content_scale_factor() const {
	return content_scale_factor;
}
void Window::set_use_font_oversampling(bool p_oversampling) {
	if (is_inside_tree() && window_id != DisplayServer::MAIN_WINDOW_ID) {
		ERR_FAIL_MSG("Only the root window can set and use font oversampling.");
	}
	use_font_oversampling = p_oversampling;
	_update_viewport_size();
}
bool Window::is_using_font_oversampling() const {