Typically, you cannot put a bag of food on a handtruck unless you’re pulling it out of storage (like from your vehicle storage or a fridge). There are instances where this is fantastic: you put a fridge and a bag of food onto a handtruck and move to a new place, then unload the fridge and drop the food back in. Works great.
Issue is, the handcart reads it as 1 Paper Bag, and the cash register likes Paper Bags. If you get close to the register, it will eat your food due to auto restocking. That also seems to break the cash register.