### Godot version

4.0-rc6

### System information

Fedora 37, Mesa Intel ADL GT2

### Issue description

Code that works as expected at runtime fails with Nil references to (assigned) exported vars in the editor:

![tool_global_position_error](https://user-images.githubusercontent.com/364501/222031460-ffb1ecbd-5175-4a42-8470-25285ba5f821.png)


### Steps to reproduce

Try to access the `global_position` of a `Node3D` that's assigned to an exported var.

See that it works at runtime.

See that it errors in the editor with:

> Invalid get index 'global_position' (on base: 'Nil').

### Minimal reproduction project

[tool_test.zip](https://github.com/godotengine/godot/files/10856640/tool_test.zip)

GDCLASS(EditorPropertyPath, EditorProperty);
	Vector<String> extensions;
	bool folder = false;
	bool global = false;
	bool save_mode = false;
	EditorFileDialog *dialog = nullptr;
	LineEdit *path = nullptr;
	Button *path_edit = nullptr;
	void _path_selected(const String &p_path);
	void _path_pressed();
	void _path_focus_exited();
	void _drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from);
	bool _can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) const;
protected:
	virtual void _set_read_only(bool p_read_only) override;
	static void _bind_methods();
	void _notification(int p_what);
public:
	void setup(const Vector<String> &p_extensions, bool p_folder, bool p_global);
	void set_save_mode();
	virtual void update_property() override;
	EditorPropertyPath();
};
class EditorPropertyLocale : public EditorProperty {