### 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)

if (!p_property.begins_with("indices") && !p_property.begins_with(PackedScene::META_POINTER_PROPERTY_BASE + "indices")) {
		return;
	}
	int index;
	if (p_property.begins_with("metadata/")) {
		index = p_property.get_slice("/", 2).to_int();
	} else {
		index = p_property.get_slice("/", 1).to_int();
	}
	Variant array;
	const Variant &original_array = object->get_array();
	if (original_array.get_type() == Variant::ARRAY) {
		
		Array temp;
		temp.assign(original_array.duplicate());
		array = temp;
	} else {
		array = original_array.duplicate();
	}
	array.set(index, p_value);
	object->set_array(array);
	emit_changed(get_edited_property(), array, "", true);
}
void EditorPropertyArray::_change_type(Object *p_button, int p_index) {