Great Egret juvenile with strange curved beak!

There is a rookery (egretry?) in residential Santa Rosa that I was photographing. The trees have many nests of Great and Snowy Egrets and Black-crowned Night-Herons. When I returned home (to Arcata, CA) and reviewed my photos, I noticed this strange beak on one of the juveniles begging food from its parent. I’m not sure if it had fledged yet. Probably a mutation?