This is something I came across by accident. Here are the steps I took:
1. Buy any product = shows up fine in the cart and checkout
2. If all (!) the products are removed from the basket page (or the shopping bag icon) than anything else you will buy will not display on the basket page.
3. Empty cache and it works fine, but this isn’t a solution.
Was wondering if any of our settings is incorrect or this is a WC bug?
Any questions, please let me know.
Regards,
George