I am sorry, but I have never heard of that. Can you post a picture. We have had a few hens whose beaks have been broken or removed by a predator, who have learned to eat again, but it is rare. I would just mix some very wet feed to make it paste, and place some on it’s beak for it to get the message to eat. Sprinkle some fpdry crumbles around it’s feet on some paper towel to see if it pecks at them. You will need to try and dip it’s beak into water and into food so that it learns. I am doubtful that it can get enough without a beak.