### 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)

options->set_clip_text(p_enable);
}
void EditorPropertyEnum::_bind_methods() {
}
EditorPropertyEnum::EditorPropertyEnum() {
	options = memnew(OptionButton);
	options->set_clip_text(true);
	options->set_flat(true);
	options->set_auto_translate(false);
	add_child(options);
	add_focusable(options);
	options->connect("item_selected", callable_mp(this, &EditorPropertyEnum::_option_selected));
}
void EditorPropertyFlags::_set_read_only(bool p_read_only) {
	for (CheckBox *check : flags) {
		check->set_disabled(p_read_only);
	}
}
void EditorPropertyFlags::_flag_toggled(int p_index) {
	uint32_t value = get_edited_property_value();
	if (flags[p_index]->is_pressed()) {
		value |= flag_values[p_index];
	} else {
		value &= ~flag_values[p_index];
	}
	emit_changed(get_edited_property(), value);
}
void EditorPropertyFlags::update_property() {