diff -r 7b1b88e27a20 -r 48c4eec2b7e6 wp/wp-includes/block-supports/custom-classname.php
--- a/wp/wp-includes/block-supports/custom-classname.php	Thu Sep 29 08:06:27 2022 +0200
+++ b/wp/wp-includes/block-supports/custom-classname.php	Fri Sep 05 18:40:08 2025 +0200
@@ -15,7 +15,7 @@
  * @param WP_Block_Type $block_type Block Type.
  */
 function wp_register_custom_classname_support( $block_type ) {
-	$has_custom_classname_support = block_has_support( $block_type, array( 'customClassName' ), true );
+	$has_custom_classname_support = block_has_support( $block_type, 'customClassName', true );
 
 	if ( $has_custom_classname_support ) {
 		if ( ! $block_type->attributes ) {
@@ -31,7 +31,7 @@
 }
 
 /**
- * Add the custom classnames to the output.
+ * Adds the custom classnames to the output.
  *
  * @since 5.6.0
  * @access private
@@ -42,7 +42,7 @@
  * @return array Block CSS classes and inline styles.
  */
 function wp_apply_custom_classname_support( $block_type, $block_attributes ) {
-	$has_custom_classname_support = block_has_support( $block_type, array( 'customClassName' ), true );
+	$has_custom_classname_support = block_has_support( $block_type, 'customClassName', true );
 	$attributes                   = array();
 	if ( $has_custom_classname_support ) {
 		$has_custom_classnames = array_key_exists( 'className', $block_attributes );