diff --git a/src/lib/Repository/ContentTypeService.php b/src/lib/Repository/ContentTypeService.php
index e1773a3b7f..63ee29092c 100644
--- a/src/lib/Repository/ContentTypeService.php
+++ b/src/lib/Repository/ContentTypeService.php
@@ -297,6 +297,11 @@ public function deleteContentTypeGroup(APIContentTypeGroup $contentTypeGroup): v
 
         $this->repository->beginTransaction();
         try {
+            $contentTypesDrafts = $this->contentTypeHandler->loadContentTypes($contentTypeGroup->id, SPIContentType::STATUS_DRAFT);
+            foreach ($contentTypesDrafts as $contentTypeDraft) {
+                $this->contentTypeHandler->delete($contentTypeDraft->id, SPIContentType::STATUS_DRAFT);
+            }
+
             $this->contentTypeHandler->deleteGroup(
                 $loadedContentTypeGroup->id
             );
diff --git a/tests/integration/Core/Repository/ContentTypeServiceTest.php b/tests/integration/Core/Repository/ContentTypeServiceTest.php
index 7f125bedee..476cfdaf4c 100644
--- a/tests/integration/Core/Repository/ContentTypeServiceTest.php
+++ b/tests/integration/Core/Repository/ContentTypeServiceTest.php
@@ -600,6 +600,36 @@ public function testDeleteContentTypeGroup()
         $this->fail('Content type group not deleted.');
     }
 
+    public function testDeleteContentTypeGroupWithOrphanedContentTypeDrafts(): void
+    {
+        $repository = $this->getRepository();
+
+        $contentTypeService = $repository->getContentTypeService();
+
+        $groupCreate = $contentTypeService->newContentTypeGroupCreateStruct(
+            'new-group'
+        );
+        $contentTypeService->createContentTypeGroup($groupCreate);
+
+        $group = $contentTypeService->loadContentTypeGroupByIdentifier('new-group');
+        for ($i = 0; $i < 3; ++$i) {
+            $contentTypeCreateStruct = $contentTypeService->newContentTypeCreateStruct('content_type_draft_' . $i);
+            $contentTypeCreateStruct->mainLanguageCode = 'eng-GB';
+            $contentTypeCreateStruct->names = [
+                'eng-GB' => 'content_type_draft_' . $i,
+            ];
+
+            $contentTypeService->createContentType($contentTypeCreateStruct, [$group]);
+        }
+
+        $contentTypeService->deleteContentTypeGroup($group);
+
+        // loadContentTypeGroup should throw NotFoundException
+        $this->expectException(NotFoundException::class);
+
+        $contentTypeService->loadContentTypeGroup($group->id);
+    }
+
     /**
      * Test for the newContentTypeCreateStruct() method.
      *