### 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)

array = p_array;
}
Variant EditorPropertyArrayObject::get_array() {
	return array;
}
EditorPropertyArrayObject::EditorPropertyArrayObject() {
}
bool EditorPropertyDictionaryObject::_set(const StringName &p_name, const Variant &p_value) {
	String name = p_name;
	if (name == "new_item_key") {
		new_item_key = p_value;
		return true;
	}
	if (name == "new_item_value") {
		new_item_value = p_value;
		return true;
	}
	if (name.begins_with("indices")) {
		int index = name.get_slicec('/', 1).to_int();
		Variant key = dict.get_key_at_index(index);
		dict[key] = p_value;
		return true;
	}
	return false;
}
bool EditorPropertyDictionaryObject::_get(const StringName &p_name, Variant &r_ret) const {