### Godot version

v4.0 rc6

### System information

Windows 10

### Issue description

When using a ViewportTexture from a SubViewport on a TextureRect, it throws errors after running the scene once and then switching scenes in the editor.
![Pasted image 20230227212626](https://user-images.githubusercontent.com/44676282/221680047-984fa03e-33d1-4856-9a7f-1700b28423cf.png)


### Steps to reproduce

Run the canvas-scene once.
Switch to another scene in the editor.
Switch back to the canvas-scene

### Minimal reproduction project

[ViewportTextureError.zip](https://github.com/godotengine/godot/files/10844099/ViewportTextureError.zip)

if (p_property.name == "size") {
		SubViewportContainer *parent_svc = Object::cast_to<SubViewportContainer>(get_parent());
		if (parent_svc && parent_svc->is_stretch_enabled()) {
			p_property.usage = PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_READ_ONLY;
		} else {
			p_property.usage = PROPERTY_USAGE_DEFAULT;
		}
	}
}
SubViewport::SubViewport() {
	RS::get_singleton()->viewport_set_size(get_viewport_rid(), get_size().width, get_size().height);
}
SubViewport::~SubViewport() {}