fix #3965

src/llamafactory/data/template.py

@@ -544,7 +544,7 @@ _register_template(
             )
         ]
     ),
-    format_system=EmptyFormatter(slots=[{"bos_token"}]),
+    format_system=StringFormatter(slots=[{"bos_token"}, "{{content}}"]),
     force_system=True,
 )