--- buggy.py
+++ fixed.py
@@ -6,7 +6,7 @@
 
 
 def read_orders(path):
-    with open(path, encoding="utf-8", newline="") as source:
+    with open(path, encoding="utf-8-sig", newline="") as source:
         return [
             {"order_id": row["order_id"], "note": row["note"]}
             for row in csv.DictReader(source)