### 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)

String name = p_name;
	if (!name.begins_with("indices") && !name.begins_with(PackedScene::META_POINTER_PROPERTY_BASE + "indices")) {
		return false;
	}
	int index;
	if (name.begins_with("metadata/")) {
		index = name.get_slice("/", 2).to_int();
	} else {
		index = name.get_slice("/", 1).to_int();
	}
	bool valid;
	r_ret = array.get(index, &valid);
	if (r_ret.get_type() == Variant::OBJECT && Object::cast_to<EncodedObjectAsID>(r_ret)) {
		r_ret = Object::cast_to<EncodedObjectAsID>(r_ret)->get_object_id();
	}
	return valid;
}
void EditorPropertyArrayObject::set_array(const Variant &p_array) {