dovecot - Jul 2011 - Dovecot 2.0.12 LMTP does not write +detail written to Delivered-To: header

Hi Timo and List,

The Dovecot 2.0.10 changelog includes:

* LMTP: For user+detail at domain deliveries, the +detail is again written
  to Delivered-To: header.

I have recipient_delimiter = + set, lmtp_save_to_detail_mailbox=yes is
working, however Dovecot 2.0.12 LMTP processes are not adding these
headers to messages on delivery.

Are there other settings that may potentially conflict with this feature?