During PaymentOrderUpdater::updateOrder, the first completed payment with a payment method will override the payment gateway and payment method stored on the order. When order is assigned multiple payments (for example a financing payment and a down payment), payments with a payment method will have precedence over payments without it even if the payments without payment method are first in the list.
We should probably assign the first completed to the order, whether or not a payment method is linked to it.
Active
3.0
Payment
This code was added as part of #3137636: commerce_payment.order_updater should sync order payment method from payment transaction → . Not sure how we can improve it...But this logic is needed for the usecase mentioned in the referenced issue.