Original prices for variable products

I have a product with variations. The original prices are $295 and $335. When I put them on sales at $245 and $285, the Shop and product page only shows the sales price as $245-$285. It does not show the original price crossed out, like the simple product.

People have no way of telling if the product is on sale or not on the product page. Only by looking at the “Sales” display on the Shop page, that one can tell it is on sale. Is this a WC issue?