Bug: org-agenda-tag-filter-preset not respected [9.3.6 (9.3.6-19-gf360f9-elpaplus @ /home/jorge/.config/emacs/elpa/27.0/develop/org-plus-contrib-20200302/)]

[Jorge P. de Morais Neto]

Hi.  Since version org-plus-contrib-20200302, my agenda is buggy.  The
bug did not occur in previous versions.  To reproduce the bug:

1. Move away your .emacs.d, so that Emacs starts with a pristine
   configuration.
2. Start Emacs and eval the following Elisp:
--8<---------------cut here---------------start------------->8---
(setq package-archives
      '(("org" . "https://orgmode.org/elpa/";)
       ("gnu" . "https://elpa.gnu.org/packages/";)))
(setq org-agenda-custom-commands
      '(("w" "Buggy"
        ((tags "now" nil))
        ((org-agenda-tag-filter-preset
          '("+@w" "-dummy"))))))
(setq org-agenda-files '("~/unison/report_org-agenda_bug/report_org_bug.org"))
(setq org-tag-alist
 '(("now"     . ?n)
   ("dummy")
   ("@w"      . ?w)))
--8<---------------cut here---------------end--------------->8---

3. Install the latest org-plus-contrib package.
4. Write to ~/unison/report_org-agenda_bug/report_org_bug.org the
   following text:
--8<---------------cut here---------------start------------->8---
* This entry should not appear in the agenda                            :now:
--8<---------------cut here---------------end--------------->8---

5. Execute M-x org-agenda RET w
6. Note that the offending entry does appear in the agenda.  It should
   not appear, since it lacks the "@w" tag -- see the value of
   org-agenda-tag-filter-preset.

This occurred in an updated Emacs 27 snapshot (guix package emacs-next).

Regards

------------------------------------------------------------------------
Emacs  : GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.13)
Package: Org mode version 9.3.6 (9.3.6-19-gf360f9-elpaplus @ 
/home/jorge/.config/emacs/elpa/27.0/develop/org-plus-contrib-20200302/)
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