diff -r be944660c56a -r 3d72ae0968f4 wp/wp-admin/includes/class-walker-nav-menu-checklist.php
--- a/wp/wp-admin/includes/class-walker-nav-menu-checklist.php	Wed Sep 21 18:19:35 2022 +0200
+++ b/wp/wp-admin/includes/class-walker-nav-menu-checklist.php	Tue Sep 27 16:37:53 2022 +0200
@@ -61,22 +61,27 @@
 	 * @see Walker_Nav_Menu::start_el()
 	 *
 	 * @since 3.0.0
+	 * @since 5.9.0 Renamed `$item` to `$data_object` and `$id` to `$current_object_id`
+	 *              to match parent class for PHP 8 named parameter support.
 	 *
 	 * @global int        $_nav_menu_placeholder
 	 * @global int|string $nav_menu_selected_id
 	 *
-	 * @param string   $output Used to append additional content (passed by reference).
-	 * @param WP_Post  $item   Menu item data object.
-	 * @param int      $depth  Depth of menu item. Used for padding.
-	 * @param stdClass $args   Not used.
-	 * @param int      $id     Not used.
+	 * @param string   $output            Used to append additional content (passed by reference).
+	 * @param WP_Post  $data_object       Menu item data object.
+	 * @param int      $depth             Depth of menu item. Used for padding.
+	 * @param stdClass $args              Not used.
+	 * @param int      $current_object_id Optional. ID of the current menu item. Default 0.
 	 */
-	public function start_el( &$output, $item, $depth = 0, $args = null, $id = 0 ) {
+	public function start_el( &$output, $data_object, $depth = 0, $args = null, $current_object_id = 0 ) {
 		global $_nav_menu_placeholder, $nav_menu_selected_id;
 
+		// Restores the more descriptive, specific name for use within this method.
+		$menu_item = $data_object;
+
 		$_nav_menu_placeholder = ( 0 > $_nav_menu_placeholder ) ? (int) $_nav_menu_placeholder - 1 : -1;
-		$possible_object_id    = isset( $item->post_type ) && 'nav_menu_item' === $item->post_type ? $item->object_id : $_nav_menu_placeholder;
-		$possible_db_id        = ( ! empty( $item->ID ) ) && ( 0 < $possible_object_id ) ? (int) $item->ID : 0;
+		$possible_object_id    = isset( $menu_item->post_type ) && 'nav_menu_item' === $menu_item->post_type ? $menu_item->object_id : $_nav_menu_placeholder;
+		$possible_db_id        = ( ! empty( $menu_item->ID ) ) && ( 0 < $possible_object_id ) ? (int) $menu_item->ID : 0;
 
 		$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
 
@@ -84,39 +89,39 @@
 		$output .= '<label class="menu-item-title">';
 		$output .= '<input type="checkbox"' . wp_nav_menu_disabled_check( $nav_menu_selected_id, false ) . ' class="menu-item-checkbox';
 
-		if ( ! empty( $item->front_or_home ) ) {
+		if ( ! empty( $menu_item->front_or_home ) ) {
 			$output .= ' add-to-top';
 		}
 
-		$output .= '" name="menu-item[' . $possible_object_id . '][menu-item-object-id]" value="' . esc_attr( $item->object_id ) . '" /> ';
+		$output .= '" name="menu-item[' . $possible_object_id . '][menu-item-object-id]" value="' . esc_attr( $menu_item->object_id ) . '" /> ';
 
-		if ( ! empty( $item->label ) ) {
-			$title = $item->label;
-		} elseif ( isset( $item->post_type ) ) {
+		if ( ! empty( $menu_item->label ) ) {
+			$title = $menu_item->label;
+		} elseif ( isset( $menu_item->post_type ) ) {
 			/** This filter is documented in wp-includes/post-template.php */
-			$title = apply_filters( 'the_title', $item->post_title, $item->ID );
+			$title = apply_filters( 'the_title', $menu_item->post_title, $menu_item->ID );
 		}
 
-		$output .= isset( $title ) ? esc_html( $title ) : esc_html( $item->title );
+		$output .= isset( $title ) ? esc_html( $title ) : esc_html( $menu_item->title );
 
-		if ( empty( $item->label ) && isset( $item->post_type ) && 'page' === $item->post_type ) {
+		if ( empty( $menu_item->label ) && isset( $menu_item->post_type ) && 'page' === $menu_item->post_type ) {
 			// Append post states.
-			$output .= _post_states( $item, false );
+			$output .= _post_states( $menu_item, false );
 		}
 
 		$output .= '</label>';
 
 		// Menu item hidden fields.
 		$output .= '<input type="hidden" class="menu-item-db-id" name="menu-item[' . $possible_object_id . '][menu-item-db-id]" value="' . $possible_db_id . '" />';
-		$output .= '<input type="hidden" class="menu-item-object" name="menu-item[' . $possible_object_id . '][menu-item-object]" value="' . esc_attr( $item->object ) . '" />';
-		$output .= '<input type="hidden" class="menu-item-parent-id" name="menu-item[' . $possible_object_id . '][menu-item-parent-id]" value="' . esc_attr( $item->menu_item_parent ) . '" />';
-		$output .= '<input type="hidden" class="menu-item-type" name="menu-item[' . $possible_object_id . '][menu-item-type]" value="' . esc_attr( $item->type ) . '" />';
-		$output .= '<input type="hidden" class="menu-item-title" name="menu-item[' . $possible_object_id . '][menu-item-title]" value="' . esc_attr( $item->title ) . '" />';
-		$output .= '<input type="hidden" class="menu-item-url" name="menu-item[' . $possible_object_id . '][menu-item-url]" value="' . esc_attr( $item->url ) . '" />';
-		$output .= '<input type="hidden" class="menu-item-target" name="menu-item[' . $possible_object_id . '][menu-item-target]" value="' . esc_attr( $item->target ) . '" />';
-		$output .= '<input type="hidden" class="menu-item-attr-title" name="menu-item[' . $possible_object_id . '][menu-item-attr-title]" value="' . esc_attr( $item->attr_title ) . '" />';
-		$output .= '<input type="hidden" class="menu-item-classes" name="menu-item[' . $possible_object_id . '][menu-item-classes]" value="' . esc_attr( implode( ' ', $item->classes ) ) . '" />';
-		$output .= '<input type="hidden" class="menu-item-xfn" name="menu-item[' . $possible_object_id . '][menu-item-xfn]" value="' . esc_attr( $item->xfn ) . '" />';
+		$output .= '<input type="hidden" class="menu-item-object" name="menu-item[' . $possible_object_id . '][menu-item-object]" value="' . esc_attr( $menu_item->object ) . '" />';
+		$output .= '<input type="hidden" class="menu-item-parent-id" name="menu-item[' . $possible_object_id . '][menu-item-parent-id]" value="' . esc_attr( $menu_item->menu_item_parent ) . '" />';
+		$output .= '<input type="hidden" class="menu-item-type" name="menu-item[' . $possible_object_id . '][menu-item-type]" value="' . esc_attr( $menu_item->type ) . '" />';
+		$output .= '<input type="hidden" class="menu-item-title" name="menu-item[' . $possible_object_id . '][menu-item-title]" value="' . esc_attr( $menu_item->title ) . '" />';
+		$output .= '<input type="hidden" class="menu-item-url" name="menu-item[' . $possible_object_id . '][menu-item-url]" value="' . esc_attr( $menu_item->url ) . '" />';
+		$output .= '<input type="hidden" class="menu-item-target" name="menu-item[' . $possible_object_id . '][menu-item-target]" value="' . esc_attr( $menu_item->target ) . '" />';
+		$output .= '<input type="hidden" class="menu-item-attr-title" name="menu-item[' . $possible_object_id . '][menu-item-attr-title]" value="' . esc_attr( $menu_item->attr_title ) . '" />';
+		$output .= '<input type="hidden" class="menu-item-classes" name="menu-item[' . $possible_object_id . '][menu-item-classes]" value="' . esc_attr( implode( ' ', $menu_item->classes ) ) . '" />';
+		$output .= '<input type="hidden" class="menu-item-xfn" name="menu-item[' . $possible_object_id . '][menu-item-xfn]" value="' . esc_attr( $menu_item->xfn ) . '" />';
 	}
 
 }