problem with gnus-alias identity rules

[Giovanni Biscuolo]

Hello,

I'm using gnus-alias.el (via Guix package) to manage my email
identities, notmuch is my MUA.

I've set up my gnus-alias-identity-alist and it works: I'm able to
select my identities via M-x gnus-alias-select-identity

I've set up a message hook like the one suggested in notmuch
documentation (https://notmuchmail.org/emacstips/#index16h2):

--8<---------------cut here---------------start------------->8---

;; Determine identity when message-mode loads
(add-hook 'message-setup-hook 'gnus-alias-determine-identity)

--8<---------------cut here---------------end--------------->8---

I've set up my gnus-alias-identity-rules (via Customize) like this:

--8<---------------cut here---------------start------------->8---

 '(gnus-alias-add-identity-menu t)
 '(gnus-alias-identity-rules
   '(("Biscuolo rule v.01"
      ("to" "<\\(.+\\)@biscuolo.net>" previous)
      "biscuolo-\\1")))
 '(gnus-alias-unknown-identity-rule 'error)
 '(gnus-alias-use-buttonized-from t)

--8<---------------cut here---------------end--------------->8---
(I've experimented various identity-rules variant, especially
"previous"->"current")

When I /reply/ to an email received with this headers:

--8<---------------cut here---------------start------------->8---

GitHub <noreply@github.com> (Yest. 11:59) ()
Subject: [GitHub] Please verify your email address.
To: Giovanni Biscuolo <g380@biscuolo.net>

--8<---------------cut here---------------end--------------->8---

gnus-alias does not select the identity I would like: biscuolo-g380 in
this case.  This is the debug message (verbosity 9):

--8<---------------cut here---------------start------------->8---

[GADI] New Headers
[GADI] ===========
In-Reply-To: 
<60ab78ede3255_437dc5bc67622@github-highworker-1d03ea7.ac4-iad.github.net.mail>
From: Giovanni Biscuolo <giovanni@biscuolo.net>
To: GitHub <noreply@github.com>
Subject: Re: [GitHub] Please verify your email address.
References: 
<60ab78ede3255_437dc5bc67622@github-highworker-1d03ea7.ac4-iad.github.net.mail>


[GADI] Evaluating <Biscuolo rule v.01>
[MSG] Using the <(biscuolo-giovanni)> Identity

--8<---------------cut here---------------end--------------->8---

Please what am I doing wrong here?

-- 
Giovanni Biscuolo

«Si può sperare
 Che il mondo torni a quote più normali».

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