Impact of programming errors in wishlist observer introduced in 1.9.4.0?

The release of 1.9.4.0 introduces two programming errors in the wishlist observer: in order to make the method Mage_Wishlist_Model_Observer::processAddToCart compatible with PHP 7.2, the two usages of count on a possible NULL value are replaced by empty while it should have been !empty.

This is the diff between 1.9.3.10 and 1.9.4.0 of the file app/code/core/Mage/Wishlist/Model/Observer.php:

--- a/app/code/core/Mage/Wishlist/Model/Observer.php +++ b/app/code/core/Mage/Wishlist/Model/Observer.php @@ -102,7 +102,7 @@ class Mage_Wishlist_Model_Observer extends Mage_Core_Model_Abstract              $  wishlistIds = array($  singleWishlistId);          }  -        if (count($  wishlistIds) && $  request->getParam('wishlist_next')){ +        if (empty($  wishlistIds) && $  request->getParam('wishlist_next')){              $  wishlistId = array_shift($  wishlistIds);               if (Mage::getSingleton('customer/session')->isLoggedIn()) { @@ -125,7 +125,7 @@ class Mage_Wishlist_Model_Observer extends Mage_Core_Model_Abstract              Mage::getSingleton('checkout/session')->setSingleWishlistId(null);          }  -        if ($  request->getParam('wishlist_next') && count($  urls)) { +        if ($  request->getParam('wishlist_next') && empty($  urls)) {              $  url = array_shift($  urls);              $  message = array_shift($  messages); 

the impact of this error is not clear to me: on the one hand the bodies of the if statements are executed exactly in wrong circumstances resulting in wishlist items not being deleted, incorrect/missing error messages in the session and redirects to NULL. But on the other hand, this logic is only triggered when the wishlist_next query parameter has a truthy value. However, I cannot find any place where wishlist_next query parameter is set.

So my question is: what is the real impact of these programming errors?