Changing Constituent on Order changes delivery method to TR_ORDER_SHIP_METHOD ID value

Anyone notice an issue in v11 when they change constituent ID on an order (whose ship method is displaying properly) and the delivery method changes to the TR_ORDER_SHIP_METHOD id value.

It's behaving as if the ship method is not available in the MOS but it is in TX_MOS_SHIP_METHOD, and the delivery method drop down is then populated with ship methods that are unrelated to that MOS.

Michael