Ticket #34637: 34637.2.diff

src/wp-admin/menu.php

@@ -86 +86 @@
         $ptype_menu_position = is_int( $ptype_obj->menu_position ) ? $ptype_obj->menu_position : ++$_wp_last_object_menu; // If we're to use $_wp_last_object_menu, increment it first.
         $ptype_for_id = sanitize_html_class( $ptype );
 
+        $menu_icon = $ptype_obj->hierarchical ? 'dashicons-admin-page' : 'dashicons-admin-post';
         if ( is_string( $ptype_obj->menu_icon ) ) {
                 // Special handling for data:image/svg+xml and Dashicons.
                 if ( 0 === strpos( $ptype_obj->menu_icon, 'data:image/svg+xml;base64,' ) || 0 === strpos( $ptype_obj->menu_icon, 'dashicons-' ) ) {