ACF Post Object empty return

I have custom post type called “Projects” and inside single-project.php view want to show Posts related to Project. I have tried to solve that problem by using ACF’s Post Object but got nothing from The Loop. I searched for the solution on Stackoverflow and AFC support page and I could not find a problem.

Maybe this ‘Post Object’ option is not even created for something like this. I don’t know.

Code inside single-project.php

if( $post_object ):

    // override $post
    $post = $post_object;
    setup_postdata( $post );

    ?>
    <div>
        <h3><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h3>
    </div>
    <?php wp_reset_postdata(); // IMPORTANT - reset the $post object so the rest of the page works correctly ?>
<?php endif; ?>

ACF configuration https://i.imgur.com/FNnUbiw.jpg

New post configuration https://i.imgur.com/IHQqR0P.jpg

Custom post type output https://i.imgur.com/YFugBZl.jpg

In the place of question marks, I want to show Posts related to that Project.