### 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)
is_mouse = true;
			physics_has_last_mousepos = true;
			physics_last_mousepos = pos;
			physics_last_mouse_state.alt = mb->is_alt_pressed();
			physics_last_mouse_state.shift = mb->is_shift_pressed();
			physics_last_mouse_state.control = mb->is_ctrl_pressed();
			physics_last_mouse_state.meta = mb->is_meta_pressed();
			if (mb->is_pressed()) {
				physics_last_mouse_state.mouse_mask.set_flag(mouse_button_to_mask(mb->get_button_index()));
			} else {
				physics_last_mouse_state.mouse_mask.clear_flag(mouse_button_to_mask(mb->get_button_index()));
				
				if (mb->get_device() == InputEvent::DEVICE_ID_EMULATION) {
					physics_has_last_mousepos = false;
				}
			}
		}
		Ref<InputEventKey> k = ev;
		if (k.is_valid()) {
			
			physics_last_mouse_state.alt = k->is_alt_pressed();
			physics_last_mouse_state.shift = k->is_shift_pressed();
			physics_last_mouse_state.control = k->is_ctrl_pressed();
			physics_last_mouse_state.meta = k->is_meta_pressed();
			continue;
		}
		Ref<InputEventScreenDrag> sd = ev;
		if (sd.is_valid()) {
			pos = sd->get_position();
		}