diff --git a/CRM/Contribute/BAO/Contribution.php b/CRM/Contribute/BAO/Contribution.php
index 721662865694..f617765c49dc 100644
--- a/CRM/Contribute/BAO/Contribution.php
+++ b/CRM/Contribute/BAO/Contribution.php
@@ -13,6 +13,7 @@
 use Civi\Api4\ContributionPage;
 use Civi\Api4\ContributionRecur;
 use Civi\Api4\Participant;
+use Civi\Api4\PaymentProcessor;
 
 /**
  *
@@ -4409,10 +4410,8 @@ public static function completeOrder($input, $ids, $objects, $isPostPaymentCreat
 
     $contributionParams['payment_processor'] = $paymentProcessorId;
 
-    // If paymentProcessor is not set then the payment_instrument_id would not be correct.
-    // not clear when or if this would occur if you encounter this please fix here & add a unit test.
     if (empty($contributionParams['payment_instrument_id']) && isset($contribution->_relatedObjects['paymentProcessor']['payment_instrument_id'])) {
-      $contributionParams['payment_instrument_id'] = $contribution->_relatedObjects['paymentProcessor']['payment_instrument_id'];
+      $contributionParams['payment_instrument_id'] = PaymentProcessor::get()->addWhere('id', '=', $paymentProcessorId)->addSelect('payment_instrument_id')->execute()->first()['payment_instrument_id'];
     }
 
     if ($recurringContributionID) {
diff --git a/tests/phpunit/CRM/Member/BAO/MembershipTest.php b/tests/phpunit/CRM/Member/BAO/MembershipTest.php
index 8cebb74c1c40..1da7704d03e0 100644
--- a/tests/phpunit/CRM/Member/BAO/MembershipTest.php
+++ b/tests/phpunit/CRM/Member/BAO/MembershipTest.php
@@ -757,7 +757,9 @@ public function testMembershipPaymentForSingleContributionMultipleMembership() {
       'original_contribution_id' => $contribution['id'],
       'contribution_status_id' => 'Completed',
     ]);
-    $this->callAPISuccessGetCount('Contribution', [], 2);
+    $contributions = $this->callAPISuccess('Contribution', 'get', ['sequential' => 1])['values'];
+    $this->assertCount(2, $contributions);
+    $this->assertEquals('Debit Card', CRM_Core_PseudoConstant::getName('CRM_Contribute_BAO_Contribution', 'payment_instrument_id', $contributions[1]['payment_instrument_id']));
     // @todo this fails depending on what tests it is run with due some bad stuff in Membership.create
     // It needs to be addressed but might involve the switch to ORDER. Membership BAO does bad line item stuff.
     // $this->callAPISuccessGetCount('LineItem', [], 6);