Ticket #31507: ms-setting.php.patch

wp-includes/ms-settings.php

@@ -62 +62 @@
                         $current_blog = get_site_by_path( $domain, $path, 1 + count( explode( '/', trim( $current_site->path, '/' ) ) ) );
                 } else {
                         // Otherwise, use the first path segment (as usual).
-                        $current_blog = get_site_by_path( $domain, $path, 1 );
+                        $current_blog = get_site_by_path( $domain, $path, 2 );
                 }
 
         } elseif ( ! is_subdomain_install() ) {