<?php
$posts = get_field('acf_relationship_field');
if( $posts ): ?>
<div class="wp-block <?php echo $align_class; ?>">
<?php foreach( $posts as $post): // variable must be called $post (IMPORTANT) ?>
<?php setup_postdata($post); ?>
<?php if ($post->post_status == 'publish') { ?>
<?php the_content(); ?>
<?php } else { ?>
<p>No posts available...</p>
<?php } ?>
<?php endforeach; ?>
</div>
<?php wp_reset_postdata(); // IMPORTANT - reset the $post object so the rest of the page works correctly ?>
<?php endif; ?>