404 Page not found error (Reloaded)

I have the same issue as mentioned here https://wordpress.org/support/topic/404-page-not-found-error-26/

– Also using Polylang
– language url are formated without “language” -> url/en/wishlist
– Same issue (404) when deleting items, url points to – > url/en/wishlist/8A9553/

– Refreshing permalinks did not do the trick

Any ideas appreciated.