Bug: [New POS] Adding a customer to an order after the sale does not save

[Jeff-Blake]

Using the new POS app for iOS, I created an order without a customer, and then on the confirmation screen I added a customer to the order. Tap "Done", refresh the order on the computer, and no customer is assigned. Went to "Orders" on the POS app, no customer there either. I tried a couple of times just to be sure.