public static function transform_sub_post_fields( &$field ) {
		if ( is_array( $field['value'] ) ) {
			$data = [];
			foreach ( $field['value'] as $post_id ) {
				$data[] = Acf::get_post_field( $post_id );
			}
			$field['value'] = $data;
		} else {
			$field['value'] = Acf::get_post_field( $field['value'] );
		}
	}