I wouldn't put that cookie sheet right under the glass dish, I would put it on a separate rack. Metal and glass expand and contract at different rates & you don't want to pay the price.
And, at the risk of looking really foolish to everyone here, I've added liquid to the glass dish in the oven - once.
It was quite humiliating to pull the thick glass pieces out of the oven door and off the floor and out of the oven. Really put a damper on the meal and the subsequent gathering for me at that time. I was still pulling glass pieces out of that oven 2 years afterwards from that dish.