diff --git a/scripts/create_data_coverage.py b/scripts/create_data_coverage.py
index ae705bd20c..ce943556d0 100644
--- a/scripts/create_data_coverage.py
+++ b/scripts/create_data_coverage.py
@@ -423,8 +423,9 @@ def aggregate_recorded_raw_data(
                     "snapshot_tested": snapshot_tested,
                     "origin": metric.get("origin", ""),
                 }
-
-                test_list.append(test_detail)
+                if test_detail not in test_list:
+                    # avoid duplicates
+                    test_list.append(test_detail)
 
     return recorded_data