Had the same issue
I just had the exact same issue today. 1. Remove your binding. 2. After removing the binding, turn it upside down so you're looking at the bottom of the binding. 3. Push upward on stuck strap (from below). The stuck portion should pop out. Once it pops out, you'll be able to reseat the notch by pulling down on the strap from below. Everything should be back to normal at this point.
Hope this helps.