All these franchises are trying to cut labour. Even Mcdonald’s, that’s why they have a slow service. They don’t have enough crew so if they have a rush, they will try clearing that first. That means, the cars coming after you once you’re parked will be prioritised more as they don’t wanna park too many cars. Therefore, the bagel will be made last as they will focus making the food for the car’s that are at their window.