Hi Carlo,
Thanks for reaching to us and appreciate your patience.
1. Could you please check how the product’s attributes filters works with some default WordPress themes like TwentyTwenty or WooCommerce Storefront to understand if it is our theme issue or not?
2. For specialized assistance and potential solutions, I kindly suggest that you reach out directly to the WooCommerce plugin’s support team https://wordpress.org/support/plugin/woocommerce/, who are better equipped to provide you with the guidance you requires.
Regards,
Hung PD