nnmail-split-fancy: Can not split on Subject

[Göktuğ Kayaalp]

Hi,

I have this configuration:

 nnmail-split-methods 'nnmail-split-fancy
 nnmail-split-fancy
 `(| (: spam-split)
     ;;; Github
     ("List-Id" "<redacted>/" "inbox")      ; Github issues on my github repos.
     ("From" "notifications@github.com" "github")
     ;;; Links
     ("Subject" "@<redacted2>" "<redacted2>")
     ;;; Self mail
     ("From" ,(macroexpand `(rx ,user-mail-address)) "self")
     "inbox")

Mail with the following subject line ends up in "self" group:

  From: "My Name" <value-of--user-mail-address>
  Subject: @<redacted2> test

where ‘<redacted2>’ is a short word of only alphanumerical characters.
What am I doing wrong?

Thanks in advance,
       gk.