Played a bot game. Started using some emotes, taunt, joke, dance all good.
Then i just happened to to also try laughing with Kayne. Played the animation but got no sound. Thought it would be due to another joke quote playing over the laugh. Tried it again. Mute. Everything else was playing just fine. Just his laughing was mute. It continued over the whole duration of the game. Everything else was there sound-wise. It was his base skin, no transformation. I have not checked with his evolved forms sadly.