This is one of the small number of rulebreaking situations which have been in the game "forever". There are a few similar GURs, as well as impossible water drops. The one that I remember is at the Road Hole, STA #17. If you hit far right of the green, short of the wall and in bounds, it will give you a GUR (why?), place the ball in the FW some 100(?) yds from the hole (wrong), and give you a penalty stroke (wrong).
BTW: Hit left of that green, and it will be called OOB.