Is there a bug for Hayato to bind Magnus?

I think in order to avoid it, when it says ''magnus is trying to break free'' you need to stop binding

Unrelated, that message pops up randomly throughout the fight even when you don't bind him.

The quickest and easiest way to fix Magnus whilst he's glitched is to suicide and then resurrect. I know that isn't the most practical way but it works. If you're in a party you will all most likely need to do that. Once he starts moving again he shouldn't kick you out.