[Plugin: Content Parts] Not working inside the loop !!

Hi.
Your ‘content parts’ is a nice plugin.
but it does not work inside the loop.
Or i mistake.
when i use this code inside the loop ( loop-search.php in this example ) :

<?php
if ( function_exists( 'the_content_part' ) ) {
the_content_part( 2 );
} else {
the_content();
}
?>

and it outputs just the content of first result for all posts in the result !!
is there any way to solve this problem?
Thanks.

https://www.ads-software.com/extend/plugins/content-parts/