### 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)
theme_color_override.erase(p_name);
	_notify_theme_override_changed();
}
void Window::remove_theme_constant_override(const StringName &p_name) {
	theme_constant_override.erase(p_name);
	_notify_theme_override_changed();
}
bool Window::has_theme_icon_override(const StringName &p_name) const {
	const Ref<Texture2D> *tex = theme_icon_override.getptr(p_name);
	return tex != nullptr;
}
bool Window::has_theme_stylebox_override(const StringName &p_name) const {
	const Ref<StyleBox> *style = theme_style_override.getptr(p_name);
	return style != nullptr;
}
bool Window::has_theme_font_override(const StringName &p_name) const {
	const Ref<Font> *font = theme_font_override.getptr(p_name);
	return font != nullptr;
}
bool Window::has_theme_font_size_override(const StringName &p_name) const {
	const int *font_size = theme_font_size_override.getptr(p_name);
	return font_size != nullptr;
}
bool Window::has_theme_color_override(const StringName &p_name) const {
	const Color *color = theme_color_override.getptr(p_name);
	return color != nullptr;
}
bool Window::has_theme_constant_override(const StringName &p_name) const {