diff --git a/wp-includes/class-wp-taxonomy.php b/wp-includes/class-wp-taxonomy.php
index 21f3d4aec9..daedb66f82 100644
--- a/wp-includes/class-wp-taxonomy.php
+++ b/wp-includes/class-wp-taxonomy.php
@@ -426,7 +426,7 @@ final class WP_Taxonomy {
 			is_callable( $args['update_count_callback'] ) &&
 			empty( $args['update_count_by_callback'] )
 		) {
-			$args['update_count_by_callback'] = function( $tt_ids, $taxonomy, $modify_by ) {
+			$args['update_count_by_callback'] = function( $tt_ids, $taxonomy ) use ( $args ) {
 				return call_user_func( $args['update_count_callback'], $tt_ids, $taxonomy );
 			};
 		}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 2a85a6808e..1bec5fdb76 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-49170';
+$wp_version = '5.6-alpha-49171';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.