Combining the author and post_type in an array

I’m running a foreach loop inside the WordPress loop to give me a list of Custom Post Types written by the author of the post in question.

This is the code I’m working with at the moment.

<?php
global $authordata, $post;
$author_id = $authordata->ID;
$cpt_id = 'featured';
$args = array( 'numberposts' => 5, 'author' => $author_id );
$myposts = get_posts( $args );
foreach( $myposts as $post ) :	setup_postdata($post); ?>
	<li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
<?php endforeach; wp_reset_postdata(); ?>
</ul>

The above shows me a list of the author’s last 5 posts without the CPT defined in the array.

<?php
global $authordata, $post;
$author_id = $authordata->ID;
$cpt_id = 'featured';
$args = array( 'post_type' => $cpt_id, 'numberposts' => 5 );
$myposts = get_posts( $args );
foreach( $myposts as $post ) :	setup_postdata($post); ?>
	<li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
<?php endforeach; wp_reset_postdata(); ?>
</ul>

The above shows me a list of the Custom Post Type in question as the author array has not been included.

<?php
global $authordata, $post;
$author_id = $authordata->ID;
$cpt_id = 'featured';
$args = array( 'post_type' => $cpt_id, 'numberposts' => 5, 'author' => $author_id );
$myposts = get_posts( $args );
foreach( $myposts as $post ) :	setup_postdata($post); ?>
	<li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
<?php endforeach; wp_reset_postdata(); ?>
</ul>

But when combining the two the result suddenly becomes blank. Am I missing something simple or is what I desire not possible. Thanks for looking at my code.