It has been calling _tags_to_maildir_flags instead since the beginning,
---
 bindings/python/notmuch/message.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bindings/python/notmuch/message.py b/bindings/python/notmuch/message.py
index bf80900..fc177eb 100644
--- a/bindings/python/notmuch/message.py
+++ b/bindings/python/notmuch/message.py
@@ -572,7 +572,7 @@ class Message(Python3StringMixIn):
             notmuch.STATUS.SUCCESS here. See there for details."""
         if not self._msg:
             raise NotInitializedError()
-        return Message._tags_to_maildir_flags(self._msg)
+        return Message._maildir_flags_to_tags(self._msg)

     def __repr__(self):
         """Represent a Message() object by str()"""
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2.8.1

</font>