Steps to reproduce (7.1 + dxp-15 + Commerce 2.0.7):
1. Create a minium site.
2. Create a new product.
3. Go to the site and choose to sort the products by "New Items".
Result: You do not see the newly added product.
(see atatched short video made by our consultant on-site)
Note: I could only reproduce this after I added a second new product.