[Dovecot] imap_logout_format don't understand %r variable

Hello list,

Dovecot version 1.2.16. In protocol imap section I have

imap_logout_format = ip=%r bytes=%i/%o

But when user disconnecting, to log file dovecot write: IMAP(user@domain): Info: Disconnected: Logged out ip= bytes=954/8644

Is this suppose to work ?