### 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)

VRS_DISABLED,
		VRS_TEXTURE,
		VRS_XR,
		VRS_MAX
	};
private:
	friend class ViewportTexture;
	Viewport *parent = nullptr;
	Viewport *gui_parent = nullptr; 
	AudioListener2D *audio_listener_2d = nullptr;
	Camera2D *camera_2d = nullptr;
	HashSet<CanvasLayer *> canvas_layers;
	RID viewport;
	RID current_canvas;
	RID subwindow_canvas;
	bool is_audio_listener_2d_enabled = false;
	RID internal_audio_listener_2d;
	bool override_canvas_transform = false;
	Transform2D canvas_transform_override;
	Transform2D canvas_transform;
	Transform2D global_canvas_transform;
	Transform2D stretch_transform;
	Size2i size = Size2i(512, 512);
	Size2i size_2d_override;
	bool size_allocated = false;
	RID contact_2d_debug;
	RID contact_3d_debug_multimesh;
	RID contact_3d_debug_instance;
	Rect2 last_vp_rect;
	bool transparent_bg = false;