[GAMEPLAY] Zhonya's Hourglass Cancelling Spells such as Swain Ultimate

Since the latest patch (4.19) Zhonya's Hourglass has been cancelling spells such as Swain ultimate. I've only had an experience with it cancelling Swain ultimate but I've heard it cancels all non channeled spells such as Morgana and Fiddlesticks Ulti. This, of course, affects gameplay significantly as a major part of playing champions such as Fiddle and Swain is ulting in the middle of a teamfight and entering stasis.