Product class missing on product type variation

I report that the product category class is missing on product type variations.
I need to target title and price for products to change according to its categories.
To be more specific, on the cart page will appear of course variable products but also product variations, well, in this case the category is not set and the variations will appear in page as products without category.

An image could help better understanding:
https://i.postimg.cc/jSsY538q/product-class-missing-on-product-type-variation.png