Ticket #10381: fix-post-ancestors.diff

wp-includes/post.php

@@ -229 +229 @@
                                 return $null;
                         _get_post_ancestors($_post);
                         wp_cache_add($_post->ID, $_post, 'posts');
+                } elseif ( !isset($_post->ancestors) ) {
+                        _get_post_ancestors($_post);
+                        wp_cache_replace($_post->ID, $_post, 'posts');
                 }
         }