### 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)
CollisionObject2D *a = Object::cast_to<CollisionObject2D>(p_a.collider);
							CollisionObject2D *b = Object::cast_to<CollisionObject2D>(p_b.collider);
							if (!a || !b) {
								return false;
							}
							int za = a->get_effective_z_index();
							int zb = b->get_effective_z_index();
							if (za != zb) {
								return zb < za;
							}
							return a->is_greater_than(b);
						}
					};
					SortArray<PhysicsDirectSpaceState2D::ShapeResult, ComparatorCollisionObjects> sorter;
					sorter.sort(res, rc);
				}
				for (int i = 0; i < rc; i++) {
					if (res[i].collider_id.is_valid() && res[i].collider) {
						CollisionObject2D *co = Object::cast_to<CollisionObject2D>(res[i].collider);
						if (co && co->can_process()) {
							bool send_event = true;
							if (is_mouse) {
								HashMap<ObjectID, uint64_t>::Iterator F = physics_2d_mouseover.find(res[i].collider_id);
								if (!F) {
									physics_2d_mouseover.insert(res[i].collider_id, frame);
									co->_mouse_enter();
								} else {