Ticket #9824: 9824.5.patch

wp-includes/rewrite.php

@@ -1907 +1907 @@
                 unset($this->comment_feed_structure);
                 $this->use_trailing_slashes = ( '/' == substr($this->permalink_structure, -1, 1) );
 
-                // Enable generic rules for pages if permalink structure doesn't begin with a wildcard.
-                if ( preg_match("/^[^%]*%(?:postname|category|tag|author)%/", $this->permalink_structure) )
-                         $this->use_verbose_page_rules = true;
-                else
-                        $this->use_verbose_page_rules = false;
+                $clean_structure = str_replace( '/' . $this->index, '', $this->permalink_structure );
+                if ( is_multisite() && !is_subdomain_install() && is_main_site() )
+                        $clean_structure = preg_replace( '/\/\w+/', '', $clean_structure );
+                $this->use_verbose_page_rules = (bool) preg_match( "#^/%(postname|category|tag|author)%#", $clean_structure );
         }
 
         /**