Ivan Sedov

function change_product_query($query) {
  $query->set( 'posts_per_page', -1 );
}
add_action( 'pre_get_posts', 'change_product_query' );

$product_cats_ids = wc_get_product_term_ids($values['product_id'], 'product_cat');
echo $product_cats_ids[0];

$terms = get_the_terms($values['product_id'], 'product_cat');
echo $terms[0]->slug;