### 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)
MODE_WINDOWED = DisplayServer::WINDOW_MODE_WINDOWED,
		MODE_MINIMIZED = DisplayServer::WINDOW_MODE_MINIMIZED,
		MODE_MAXIMIZED = DisplayServer::WINDOW_MODE_MAXIMIZED,
		MODE_FULLSCREEN = DisplayServer::WINDOW_MODE_FULLSCREEN,
		MODE_EXCLUSIVE_FULLSCREEN = DisplayServer::WINDOW_MODE_EXCLUSIVE_FULLSCREEN,
	};
	enum Flags {
		FLAG_RESIZE_DISABLED = DisplayServer::WINDOW_FLAG_RESIZE_DISABLED,
		FLAG_BORDERLESS = DisplayServer::WINDOW_FLAG_BORDERLESS,
		FLAG_ALWAYS_ON_TOP = DisplayServer::WINDOW_FLAG_ALWAYS_ON_TOP,
		FLAG_TRANSPARENT = DisplayServer::WINDOW_FLAG_TRANSPARENT,
		FLAG_NO_FOCUS = DisplayServer::WINDOW_FLAG_NO_FOCUS,
		FLAG_POPUP = DisplayServer::WINDOW_FLAG_POPUP,
		FLAG_EXTEND_TO_TITLE = DisplayServer::WINDOW_FLAG_EXTEND_TO_TITLE,
		FLAG_MOUSE_PASSTHROUGH = DisplayServer::WINDOW_FLAG_MOUSE_PASSTHROUGH,
		FLAG_MAX = DisplayServer::WINDOW_FLAG_MAX,
	};
	enum ContentScaleMode {
		CONTENT_SCALE_MODE_DISABLED,
		CONTENT_SCALE_MODE_CANVAS_ITEMS,
		CONTENT_SCALE_MODE_VIEWPORT,
	};
	enum ContentScaleAspect {
		CONTENT_SCALE_ASPECT_IGNORE,
		CONTENT_SCALE_ASPECT_KEEP,
		CONTENT_SCALE_ASPECT_KEEP_WIDTH,
		CONTENT_SCALE_ASPECT_KEEP_HEIGHT,
		CONTENT_SCALE_ASPECT_EXPAND,
	};
	enum LayoutDirection {