Ticket #24622: If-Modified-Since_Bug_rev2.patch

wp-includes/class-wp.php

@@ -300 +300 @@
                                 $this->query_vars[$var] = $this->extra_query_vars[$var];
                 }
 
+                if ( isset( $this->query_vars['feed'] )
+                        && in_array( $this->query_vars['feed'], array( 'comments-rss2', 'comments-atom' ))
+                        && empty( $this->query_vars['withcomments'] )
+                )
+                        $this->query_vars['withcomments'] = true;
+
                 if ( isset($error) )
                         $this->query_vars['error'] = $error;