Is Trust Kukki-Chebukki Broken?

I summoned him and he didn't cast ANY spells the entire time all, he did was cheer and make other like gestures. Was he changed in an update or is this a bug/glitch? I was on my BST at the time, or is there some req. for him (Kukki) now to get him to cast?

UPDATE: He's casting but only Sleepga.

I think I saw somewhere that he only casts spells based on the day, and if the enemy resists, he won't do anything. So fighting an ice-resistant mob on ice day will leave him doing nothing.