diff -r be944660c56a -r 3d72ae0968f4 wp/wp-includes/customize/class-wp-customize-nav-menu-item-setting.php
--- a/wp/wp-includes/customize/class-wp-customize-nav-menu-item-setting.php	Wed Sep 21 18:19:35 2022 +0200
+++ b/wp/wp-includes/customize/class-wp-customize-nav-menu-item-setting.php	Tue Sep 27 16:37:53 2022 +0200
@@ -653,12 +653,16 @@
 	 * we remove that in this override.
 	 *
 	 * @since 4.3.0
+	 * @since 5.9.0 Renamed `$menu_item_value` to `$value` for PHP 8 named parameter support.
 	 *
-	 * @param array $menu_item_value The value to sanitize.
+	 * @param array $value The menu item value to sanitize.
 	 * @return array|false|null|WP_Error Null or WP_Error if an input isn't valid. False if it is marked for deletion.
 	 *                                   Otherwise the sanitized value.
 	 */
-	public function sanitize( $menu_item_value ) {
+	public function sanitize( $value ) {
+		// Restores the more descriptive, specific name for use within this method.
+		$menu_item_value = $value;
+
 		// Menu is marked for deletion.
 		if ( false === $menu_item_value ) {
 			return $menu_item_value;