WooCommerce Wishlists Version 2.3.22 Changelog
* Fix: Empty wishlists were being created for requests that could not add anything. On a variable product, following the add-to-wishlist link without choosing options created the list first and only then discovered there was nothing to put in it, leaving it behind – so search engine crawlers, which follow that link, produced one empty temporary list per visit. One store accumulated 11,000 of them. The product is now resolved and checked before any list is created, so a request that cannot add anything leaves nothing behind. Existing empty lists are not removed by this update; they can be deleted safely.
* Fix: Choosing a variation through the add-to-wishlist link failed with "Please choose product options" even when the options were named in the URL. The variation lookup read only posted data, while the link is a normal link and carries its attributes in the query string. It now reads both, matching the validation immediately after it, which always did.