Index: wp-includes/taxonomy-functions.php
===================================================================
--- wp-includes/taxonomy-functions.php	(revision 34843)
+++ wp-includes/taxonomy-functions.php	(working copy)
@@ -1373,6 +1373,8 @@
 	 * parameter alone.
 	 *
 	 * Use of this filter can result in unpredictable behavior, and is not recommended.
+	 * If using this filter, you should also consider using 'get_terms_fields_terms' to
+	 * arrange the output accordingly.
 	 *
 	 * @since 2.8.0
 	 *
@@ -1485,6 +1487,25 @@
 		foreach ( $terms as $term ) {
 			$_terms[ $term->term_id ] = $term->slug;
 		}
+	} else {
+
+		/**
+		 * Filter the terms to arrange the return accordingly.
+		 *
+		 * Field lists modified using this filter will only modify the term fields returned
+		 * by the function when the `$fields` parameter set to a custom value different from
+		 * default values.
+		 *
+		 * Use of this filter can result in unpredictable behavior, and is not recommended.
+		 *
+		 * @since 4.4.0
+		 *
+		 * @param array $_terms     An array of terms to return.
+		 * @param string $_fields   Current fields parameter.
+		 * @param array $args       An array of term query arguments.
+		 * @param array $taxonomies An array of taxonomies.
+		 */
+		$_terms = apply_filters( 'get_terms_fields_terms', $_terms, $_fields, $args, $taxonomies );
 	}
 
 	if ( ! empty( $_terms ) ) {