[Dovecot] file name missing component in error message

Hi, we occasionally see this error message from
maildir_mail_set_cache_corrupted(): "Maildir filename has wrong W
value: %s/%s" but the path it prints is missing a component,
specifically, the new/cur/tmp component. For example: /Volumes/Spool/user/maildir/12345.M123P123.example.com.... should be /Volumes/Spool/user/maildir/cur/12345.M123P123.example.com....

This is using dovecot-1.1.10.

Now I just have to figure out why the file is corrupted in the first
place.