Missing variant in dataLayer_content

Here’s a situation: Woocommerce variable product with two variations: size + color.

A) If there are set variations for every color and size (like in this screenshot), “dataLayer_content” correctly outputs “variant”:”XL,BALTA” (size,color) at the end of it. These values can be then used in GTM and elsewhere.

B) But if the product has no set variation for every combination and it’s simply left at “Any size” and “Any color” (like in this screenshot), then “dataLayer_content” outputs empty “variant”:”,” – no product variation names included!