ACP2E-1245: Something went wrong" error is displayed when clearing the completed bulk tasks.

Author: veloraven

app/code/Magento/AsynchronousOperations/Controller/Adminhtml/Notification/Dismiss.php

@@ -55,7 +55,7 @@ public function execute()
         $isAcknowledged = $this->notificationManagement->acknowledgeBulks($bulkUuids);
 
         /** @var \Magento\Framework\Controller\Result\Json $result */
-        $result = $this->resultFactory->create(ResultFactory::TYPE_JSON);
+        $result = $this->resultFactory->create(ResultFactory::TYPE_RAW);
         if (!$isAcknowledged) {
             $result->setHttpResponseCode(400);
         }

app/code/Magento/AsynchronousOperations/Test/Unit/Controller/Adminhtml/Notification/DismissTest.php

@@ -95,7 +95,7 @@ public function testExecuteSetsBadRequestResponseStatusIfBulkWasNotAcknowledgedC
 
         $this->resultFactoryMock->expects($this->once())
             ->method('create')
-            ->with(ResultFactory::TYPE_JSON, [])
+            ->with(ResultFactory::TYPE_RAW, [])
             ->willReturn($this->jsonResultMock);
 
         $this->notificationManagementMock->expects($this->once())