Where are you looking for the list? It used to save to your Keep account and be visible in Google Keep. Google changed that functionality a few months ago and added a Shopping List buried within the Assistant / Home app, and that's where Shopping Lists are saved now. I like a lot of the new functionality Google introduces, but I don't understand this idea. It used to be easy & simple...add a new item to my Shopping List, open Keep and there it was. Now I have to dig through the Home app (or Assistant to try and find my voice activated shopping list). Strange implementation.