Why is product metadata not saved?

Question

WordPress

Hello everyone!
I want to massively change product descriptions, but the result of the update_post_meta execution is not written to the database.
What's wrong?

add_action('admin_init', 'replace_products');
function replace_products(){
      $prod = wc_get_product('2425274161');
      $id = $prod->get_id();
      $description = $prod->get_description('edit');
      $search_string = 'Субпродукты и рубец';
      $new_description = str_replace($search_string, 'рубец', $description);
      update_post_meta($id, 'description', $new_description, $description);
}

Answer 1

In short, it works if done not through update_post_meta but through $product->set_description();
I feel like I'll never understand how Wookomers posts work :(