It sounds as if you’ve attached photos, but I’m not seeing them. In any case, what you describe sounds like wet periople.
The periople is a protective layer that extends over the newly generated hoof. It’s variable in length and consistency, but it will generally extend downward about 1/4″ on a “normal” sized hoof. In dry conditions, it will appear similar to a dried glue and will easily flake away. In wet conditions, it will tend to thicken, lengthen, and appear more rubbery (similar to a pencil eraser), and it will often evidence with little “worm holes.”
~~Danvers // Promoting equine health and welfare from the ground up!