With some help from my friend, I was able to recreate the bug where phantom strike lands you inside of map geometry. In order to reproduce this, I had my friend walk into the pillar while hugging it as tightly as they could. (Slanted toward me and to my left, so that if they continued walking...
(Turn up your volume to hear the beeping that was caused by moving my mouse) I had to unplug my pc to get it to shut off since the power button wasn't responsive. Needless to say I was more than a little caught of guard lol.
Screenshot of my computer specs
His ult allows him to bypass barriers that he shouldn't be able to cross and it causes him to get stuck. This can also happen with the barrier in the back of enemy spawn