I have migrated a site from Drupal 6 to Drupal 7. I have rendered the search form in page.tpl.php as follows:

<?php
     $block = module_invoke('search','block_view','form');          
     print render($block['content']); 
?>

I am able to search, but pagination is missing in the search result page.

In the theme folder I have search-results.tpl.php and search-results.tpl.php.

In the search-results.tpl.php <?php print $pager; ?> is available.

If I change theme to default theme or core theme pagination is working fine.

What is the issue over here which is causing not showing pagination links?