leafnode 2 not creating "all_links" in gmane hierarchy.

I'm running leafnode-2.0.0.alpha20090908a.luascript with  the line
"create_all_links = 1" uncommented in my config file, but for some
reason I'm not getting gmane.spam.detected in my Xref headers.

For example, one of the messages in my spool includes these headers

#v+
Newsgroups: gmane.comp.gnome.apps.gnucash.user,gmane.spam.detected
Xref: bunsen.ducksburg.lan gmane.comp.gnome.apps.gnucash.user:15231
#v-

and there is *no* gmane/spam/detected directory in the news spool at
all.  Any idea what I'm missing?  AFAICT, leafnode is "creating all
links" for non-gmane groups.  My gmane config does include the
following constraint, but that should match gmane.spam.detected too.

#v+
server = news.gmane.org
only_groups_pcre = (gmane\.|control\.)
#v-


(The point of this, in case anyone wonders why I noticed & care, is
that I'd prefer to use Xref rather than Newsgroups for slrn scoring.)