Hi again.
We have checked and found the issue from the default function of the WooCommerce plugin. It doesn't allow to display the attribute have 2+word, and it also doesn't display the product have more than 3+ attribute on the product title.
You can find the function in this file /wp-content/plugins/woocommerce/includes/data-stores/class-wc-product-variation-data-store-cpt.php function: generate_product_title().
As I see your attribute (Modelli figure, Modello Clip) have 2+ word at name and slug. Please use 1 word for the product attribute and try it again.
Please check your product attribute config again.
Thanks.