Thanks, I replaced org-cycle/org-global-cycle with
outline-cycle/outline-cycle-buffer, and then the outlining works.

On Tue, 6 Feb 2024 at 18:56, Ihor Radchenko <yantar92@posteo.net> wrote:

> Daniel Clemente <n142857@gmail.com> writes:
>
> > I also see the warnings. In my case it's because I'm using outline-minor
> > mode in an elisp file. I'm not sure it's supported, but it worked years
> > ago: ...
>
> It is not supported by Org mode.
> The modern outline mode has `outline-cycle'.
>
> --
> Ihor Radchenko // yantar92,
> Org mode contributor,
> Learn more about Org mode at <https://orgmode.org/>.
> Support Org development at <https://liberapay.com/org-mode>,
> or support my work at <https://liberapay.com/yantar92>
>