404 on Product detail page?Ran into this issue where I needed a url structure such as/shop/<category> and /shop/<category>/<product>/.
/shop/<category>/ works fine but once you click a product you get a nice looking 404 page.
Product category base - /shop
Product permalink base -> Custom Structure - /shop/%product_cat%
The Fix:Set the ‘Product category base’ to shop and the custom product base to /shop/%product_cat%.
Then in your functions.php file add this little snippet: