Products with discount are not shown in Woocommerce on sale block

Hi:

I have created a “Products on Sale” page using the default Woccommerce on sale products block, but the products that have a discount using the plugin are not shown, just the products that have a discount set directly in product editing.

I don’t know what’s wrong, because the discounts are shown in store, in product page, etc but not on the products on sale block.

Any clue?

Thank you!