diff --git a/mailpoet/lib/Form/FormsRepository.php b/mailpoet/lib/Form/FormsRepository.php
index a3cd0b4474..181a4f5608 100644
--- a/mailpoet/lib/Form/FormsRepository.php
+++ b/mailpoet/lib/Form/FormsRepository.php
@@ -96,10 +96,17 @@ class FormsRepository extends Repository {
       return 0;
     }
 
-    return $this->entityManager->createQueryBuilder()
+    $result = $this->entityManager->createQueryBuilder()
       ->delete(FormEntity::class, 'f')
       ->where('f.id IN (:ids)')
       ->setParameter('ids', $ids)
       ->getQuery()->execute();
+
+    // delete was done via DQL, make sure the entities are also detached from the entity manager
+    $this->detachAll(function (FormEntity $entity) use ($ids) {
+      return in_array($entity->getId(), $ids, true);
+    });
+
+    return $result;
   }
 }
diff --git a/mailpoet/lib/Newsletter/Sending/SendingQueuesRepository.php b/mailpoet/lib/Newsletter/Sending/SendingQueuesRepository.php
index 533712383c..f6da88c5f8 100644
--- a/mailpoet/lib/Newsletter/Sending/SendingQueuesRepository.php
+++ b/mailpoet/lib/Newsletter/Sending/SendingQueuesRepository.php
@@ -167,6 +167,11 @@ class SendingQueuesRepository extends Repository {
       ->setParameter('task', $scheduledTask)
       ->getQuery()
       ->execute();
+
+    // delete was done via DQL, make sure the entities are also detached from the entity manager
+    $this->detachAll(function (SendingQueueEntity $entity) use ($scheduledTask) {
+      return $entity->getTask() === $scheduledTask;
+    });
   }
 
   public function saveCampaignId(SendingQueueEntity $queue, string $campaignId): void {