diff --git a/kobo/apps/subsequences/tests/test_submission_stream.py b/kobo/apps/subsequences/tests/test_submission_stream.py
index 689ece4c0f..4542d603e1 100644
--- a/kobo/apps/subsequences/tests/test_submission_stream.py
+++ b/kobo/apps/subsequences/tests/test_submission_stream.py
@@ -241,3 +241,47 @@ def mock_submission_stream():
         assert '_supplementalDetails' in output[0]
         assert '_supplementalDetails' in output[1]
         # test other things?
+
+    def test_stream_with_extras_handles_duplicated_submission_uuids(self):
+        # Define submission data with duplicated UUIDs
+        submissions = [
+            {
+                'What_s_your_name': 'Ed',
+                'Tell_me_a_story': 'ed-18_6_24.ogg',
+                'meta/instanceID': 'uuid:1c05898e-b43c-491d-814c-79595eb84e81',
+                '_uuid': '1c05898e-b43c-491d-814c-79595eb84e81',
+            },
+            {
+                'What_s_your_name': 'Ed',
+                'Tell_me_a_story': 'ed-18_6_44.ogg',
+                'meta/instanceID': 'uuid:1c05898e-b43c-491d-814c-79595eb84e81',
+                '_uuid': '1c05898e-b43c-491d-814c-79595eb84e81',
+            },
+        ]
+        self.asset.deployment.mock_submissions(submissions)
+
+        # Process submissions with extras
+        output = list(
+            stream_with_extras(
+                self.asset.deployment.get_submissions(user=self.asset.owner),
+                self.asset,
+            )
+        )
+
+        # Make sure that uuid values for single or multiple choice qualitative
+        # analysis questions are kept as strings and not mutated
+        for submission in output:
+            supplemental_details = submission['_supplementalDetails']
+            for qual_response in supplemental_details['Tell_me_a_story']['qual']:
+                if qual_response['type'] not in [
+                    'qual_select_one',
+                    'qual_select_multiple',
+                ]:
+                    # question is not a single or multiple choice one
+                    continue
+
+                for v in qual_response['val']:
+                    assert isinstance(v['uuid'], str)
+
+        # Clear all mocked submissions to avoid duplicate submission errors
+        self.asset.deployment.mock_submissions([])
diff --git a/kobo/apps/subsequences/utils/__init__.py b/kobo/apps/subsequences/utils/__init__.py
index 7703fc1905..bddf773004 100644
--- a/kobo/apps/subsequences/utils/__init__.py
+++ b/kobo/apps/subsequences/utils/__init__.py
@@ -150,7 +150,7 @@ def stream_with_extras(submission_stream, asset):
             uuid = submission[SUBMISSION_UUID_FIELD]
         else:
             uuid = submission['_uuid']
-        all_supplemental_details = extras.get(uuid, {})
+        all_supplemental_details = deepcopy(extras.get(uuid, {}))
         for qpath, supplemental_details in all_supplemental_details.items():
             try:
                 all_qual_responses = supplemental_details['qual']