Hi Viktor, thanks for the patient and detailed debugging.
I don't have time to test the attached patch myself, but given your description it should be okay. Can you test it and report? Otherwise I will test this myself later on. Thanks!
diff --git a/lisp/org.el b/lisp/org.el index c76ddd0..d75f6c2 100644 --- a/lisp/org.el +++ b/lisp/org.el @@ -17985,9 +17985,8 @@ When a buffer is unmodified, it is just killed. When modified, it is saved (append org-todo-keyword-alist-for-agenda org-todo-key-alist)) (setq org-drawers-for-agenda (append org-drawers-for-agenda org-drawers)) - (unless (equal org-tag-alist-for-agenda org-tag-alist) - (setq org-tag-alist-for-agenda - (append org-tag-alist-for-agenda org-tag-alist))) + (setq org-tag-alist-for-agenda + (org-uniquify (append org-tag-alist-for-agenda org-tag-alist))) (if org-group-tags (setq org-tag-groups-alist-for-agenda (org-uniquify-alist
-- Bastien
