Order summary shows incorrect total after applying a coupon code

I encounter the same bug and tracked it down to the order changes in \Drupal\commerce_promotion\Plugin\Commerce\InlineForm\CouponRedemption::applyCoupon and \Drupal\commerce_promotion\Plugin\Commerce\InlineForm\CouponRedemption::removeCoupon having no effect on the order in the checkout flow form object.

If you add following code (which forces the order to be reloaded in the form object) after saving the order in these methods, the issue is fixed.

This is obviously not the proper fix. I guess the best solution would be to extend \Drupal\commerce_checkout\Plugin\Commerce\CheckoutFlow\CheckoutFlowBase with a setOrder method?

matthijs → changed the visibility of the branch 3107501-order-summary-shows to hidden.

matthijs → changed the visibility of the branch 3107501-order-summary-shows to active.

Considering this breaks tests, updating the status to "Needs work".