Fix: refresh from DB after API-patch-operations

src/pretix/base/services/orders.py

@@ -2317,6 +2317,7 @@ class OrderChangeManager:
                 self._check_and_lock_memberships()
                 try:
                     self._perform_operations()
+                    self.order.refresh_from_db()
                 except TaxRule.SaleNotAllowed:
                     raise OrderError(self.error_messages['tax_rule_country_blocked'])
             self._recalculate_total_and_payment_fee()

src/tests/api/test_order_change.py

@@ -1673,6 +1673,8 @@ def test_order_change_patch(token_client, organizer, event, order, quota):
         assert p.item == item2
         f.refresh_from_db()
         assert f.value == Decimal('10.00')
+        order.refresh_from_db()
+        assert order.total == Decimal('109.44')
 
 
 @pytest.mark.django_db