I’ve just begun bread backing and attempted challah for the first time today. I follow peter Reinharts recipe where you proof it overnight in the fridge. I got massive amounts of blowout/tearing, I’m not sure if this is the same as oven spring. I did a simple 3 strand braid. This recipe calls for an hour rest after braiding before baking at room temp, I had something come up so it sat about 2 hours instead, it did rise a little in that time. I don’t know if overproofing can cause this. My kitchen is very cold living in New England. I’ve attached a photo. It tastes ok, I prefer a sweeter challah and to me it’s a little yeasty.