### 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)
_make_transient();
			}
			if (visible) {
				notification(NOTIFICATION_VISIBILITY_CHANGED);
				emit_signal(SceneStringNames::get_singleton()->visibility_changed);
				RS::get_singleton()->viewport_set_active(get_viewport_rid(), true);
			}
			notification(NOTIFICATION_THEME_CHANGED);
		} break;
		case NOTIFICATION_THEME_CHANGED: {
			emit_signal(SceneStringNames::get_singleton()->theme_changed);
			_invalidate_theme_cache();
			_update_theme_item_cache();
		} break;
		case NOTIFICATION_READY: {
			if (wrap_controls) {
				
				_update_child_controls();
			}
		} break;
		case NOTIFICATION_TRANSLATION_CHANGED: {
			_invalidate_theme_cache();
			_update_theme_item_cache();
			if (!embedder && window_id != DisplayServer::INVALID_WINDOW_ID) {
				String tr_title = atr(title);
#ifdef DEBUG_ENABLED
				if (window_id == DisplayServer::MAIN_WINDOW_ID) {