Thanks Ihor, I sent a new patch with your comment included verbatim, and
also added a ChangeLog entry.

On Tue, Feb 7, 2023 at 12:47 PM Aaron L. Zeng <me@bcc32.com> wrote:

> * org-agenda.el (org--batch-store-agenda-views): Fix treatment of
> lambda functions used as custom agenda commands.
> `org-agenda-custom-commands' entries may specify a custom function
> instead of a symbol like `tags-todo'.  `org--batch-store-agenda-views'
> behaved differently from `org-agenda' when that custom function was
> defined as a lambda rather than a symbol, incorrectly treating the
> lambda form as a list of agenda commands.  Instead, use the same test
> as `org-agenda' does to determine whether the command is a series.
> ---
>  lisp/org-agenda.el | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/lisp/org-agenda.el b/lisp/org-agenda.el
> index 1d1f2271b..49f93c338 100644
> --- a/lisp/org-agenda.el
> +++ b/lisp/org-agenda.el
> @@ -3525,10 +3525,13 @@ This ensures the export commands can easily use
> it."
>    (let ((cmds (org-agenda-normalize-custom-commands
> org-agenda-custom-commands))
>          (pop-up-frames nil)
>          (dir default-directory)
> -        cmd thiscmdkey thiscmdcmd match files opts cmd-or-set bufname)
> +        cmd thiscmdkey thiscmdcmd match files opts cmd-or-set
> +        seriesp bufname)
>      (save-window-excursion
>        (while cmds
>         (setq cmd (pop cmds)
> +              ;; series:     (0:key 1:desc 2:(cmd1 cmd2 ...)
> 3:general-settings 4:files)
> +              ;; non-series: (0:key 1:desc 2:type 3:match    4:settings
>        5:files)
>               thiscmdkey (car cmd)
>               thiscmdcmd (cdr cmd)
>               match (nth 2 thiscmdcmd)
> @@ -3538,8 +3541,9 @@ This ensures the export commands can easily use it."
>                               (format "*Org Agenda(%s)*" thiscmdkey))
>                         org-agenda-buffer-name)
>               cmd-or-set (nth 2 cmd)
> -             opts (nth (if (listp cmd-or-set) 3 4) cmd)
> -             files (nth (if (listp cmd-or-set) 4 5) cmd))
> +             seriesp (not (or (symbolp cmd-or-set) (functionp
> cmd-or-set)))
> +             opts (nth (if seriesp 3 4) cmd)
> +             files (nth (if seriesp 4 5) cmd))
>         (if (stringp files) (setq files (list files)))
>         (when files
>           (let* ((opts (append org-agenda-exporter-settings opts))
> --
> 2.38.1
>
>