FYI folks
You may encounter all of your ancestral recipes were reset with no way to interact with them.
Restarting game makes no difference.
The only way I resolved this was by buying an item on the Bazaar store, which then unlocked all previously purchased ancestral recipes. The item I bought was a new recipe I did not already own.
I am aware that other gamers might not want to buy an item just to fix the recipe problem.
In which case…what do they do?
Beware!