Purchased product variants are presented as the first variant in the Order details' "Items" tab.

Steps to reproduce:
1. Create a product with at least two variants, assign prices and availability to both variants.
2. Go to shop storefront and make a purchase including both product variants.
3. Complete the purchase.
4. In the Back Office, go to Orders, view the latest order, and go to the "Items" tab.

Expected result:
Both variants are listed as purchased products.

Actual result:
The Items list contains two rows, but with the first variant listed in both rows (see screenshot).

Note: The correct price for the second variant is used. Stock is reduced correctly for both variants.