Skye's ultimate tracking is still so buggy, it can fly up mid air to reach you but somehow it cant get over a Sage wall? Instead it tries to break it and then continue it's path. The general pathing sometimes is so bugged out it will just keep going up and down over and over again until it runs out

If you're on top of the Platform on B haven for example the Ult will just get up on the platform and try to stun you, the same thing if you're on B rafters on split the ult will fly towards you but if it's behind a sage wall it will bug out and not do anything until the wall breaks