### 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)

#include "scene/resources/mesh.h"
#include "scene/resources/text_line.h"
#include "scene/resources/world_2d.h"
#include "scene/scene_string_names.h"
#include "servers/audio_server.h"
#include "servers/rendering/rendering_server_globals.h"
void ViewportTexture::setup_local_to_scene() {
	
	if (!vp_changed) {
		return;
	}
	if (vp_pending) {
		return;
	}
	Node *loc_scene = get_local_scene();
	if (!loc_scene) {
		return;
	}
	if (vp) {
		vp->viewport_textures.erase(this);
		vp = nullptr;
	}
	if (loc_scene->is_ready()) {
		_setup_local_to_scene(loc_scene);
	} else {
		loc_scene->connect(SNAME("ready"), callable_mp(this, &ViewportTexture::_setup_local_to_scene).bind(loc_scene), CONNECT_ONE_SHOT);
		vp_pending = true;
	}
}
void ViewportTexture::set_viewport_path_in_scene(const NodePath &p_path) {