I solved this issue changing directly in the function of woocommerce .
Navigate to: wp-content > plugins > woocommerce > includes > data-stores > class-wc-product-variation-data-store-cpt.php
At line 291 you can see the function “generate_product_title”.
We need to set $should_include_attributes always “true” and change the number “1” to bigger then your attributes count.
Bye.
