Woocommerce excluding current product from related products

I'm trying to exclude the current product by using the code below, but instead of excluding, it retrieves all the default posts and not products. Probably it's not working at all.

    <?php
        global $post;
            $terms = get_the_terms( $post->ID, 'product_cat' );     
            foreach ($terms  as $term  ) {         
                $product_cat_name = $term->name;
                break;
            }           
        $ids = array(); 

        $currentID = get_the_ID();

        $args = array('post_type' => 'product', 'product_cat' => $product_cat_name, 'post__not_in' => array($currentID));   
        $loop = new WP_Query( $args );
        while ( $loop->have_posts() ) : $loop->the_post(); global $product; 
            $ids[] = $loop->post->ID; 
        endwhile;
        wp_reset_query();   

        print_r($ids);
 ?>

Using this will include the current post and it displays the product only.

<?php
    global $post;
        $terms = get_the_terms( $post->ID, 'product_cat' );     
        foreach ($terms  as $term  ) {         
            $product_cat_name = $term->name;
            break;
        }           
    $ids = array(); 

    $currentID = get_the_ID();

    $args = array('post_type' => 'product', 'product_cat' => $product_cat_name);    
    $loop = new WP_Query( $args );
    while ( $loop->have_posts() ) : $loop->the_post(); global $product; 
        $ids[] = $loop->post->ID; 
    endwhile;
    wp_reset_query();   

    print_r($ids);
?>