### Godot version

4.2 eca6f0e

### System information

Windows 10 x64

### Issue description


https://github.com/godotengine/godot/assets/2223172/a2796263-4e2e-4b14-a080-b3ad034cc141



### Steps to reproduce

1. Add SubViewport
2. Add Sprite2D
3. Set spirte's texture to ViewportTexture
4. Create new scene
5. Instance the new scene inside the scene with viewport
6. Make sure both scenes are opened
7. Go to instance scene and save it
8. Go to viewport scene

You will see error spam. Reloading the scene fixes it.

### Minimal reproduction project

[vip.zip](https://github.com/godotengine/godot/files/12292386/vip.zip)

bool _camera_3d_add(Camera3D *p_camera); 
	void _camera_3d_remove(Camera3D *p_camera);
	void _camera_3d_make_next_current(Camera3D *p_exclude);
	void enable_camera_3d_override(bool p_enable);
	bool is_camera_3d_override_enabled() const;
	void set_camera_3d_override_transform(const Transform3D &p_transform);
	Transform3D get_camera_3d_override_transform() const;
	void set_camera_3d_override_perspective(real_t p_fovy_degrees, real_t p_z_near, real_t p_z_far);
	void set_camera_3d_override_orthogonal(real_t p_size, real_t p_z_near, real_t p_z_far);
	void set_disable_3d(bool p_disable);
	bool is_3d_disabled() const;
	Ref<World3D> world_3d;
	Ref<World3D> own_world_3d;
	void set_world_3d(const Ref<World3D> &p_world_3d);
	Ref<World3D> get_world_3d() const;
	Ref<World3D> find_world_3d() const;
	void _own_world_3d_changed();
	void set_use_own_world_3d(bool p_use_own_world_3d);
	bool is_using_own_world_3d() const;
	void _propagate_enter_world_3d(Node *p_node);
	void _propagate_exit_world_3d(Node *p_node);
	void set_use_xr(bool p_use_xr);
	bool is_using_xr();
#endif 
	void _propagate_world_2d_changed(Node *p_node);
	void _validate_property(PropertyInfo &p_property) const;
	Viewport();
	~Viewport();
};
class SubViewport : public Viewport {