I was definitely able to teleport into the tall box in A Lobby Haven as Omen pre-patch, and now I am unable to do so. Is this an undocumented change? Is it a bug? Or am I just dumb? This was one of my favorite spots to make a Flexinja play...

You have to choose a agent. So your abilities will be that agents kit + an extra ult of any agent. It cannot be of that agents itself. So for mine it will be Fade + neons ult. What will your be?