Ticket #21288: 21288.diff

wp-includes/capabilities.php

@@ -1135 +1135 @@
                 else
                         $caps = map_meta_cap( 'edit_post', $user_id, $post->ID );
                 break;
+        case 'publish_post':
+                $post = get_post( $args[0] );
+                $post_type = get_post_type_object( $post->post_type );
+
+                $caps[] = $post_type->cap->publish_posts;
+                break;
         case 'edit_post_meta':
         case 'delete_post_meta':
         case 'add_post_meta':