problem with the new snapshot 17w15a

Here is where I suppose to say what happened. So while I was trying out the new snapshot I tried to see what I could do with the new features and what I could not (bouncy colored beds, torches being able to be placed in the back of strairs etc.) but accidentaly I tried to place a torch underneath a stair (a normaly placed one |_ <-- like this) and the game crashed. I wasn't sure if the stair was the reason so I tried once more. It crashed again, I tried a third time so that I was sure and it crashed again.