Org-mode babel shell async evaluation not working with named sessions

Question

I'm trying to use shell asynchronously with named sessions, but it doesn't work:

#+begin_src sh
  echo "a"
#+end_src

#+RESULTS:
: a

#+begin_src sh :async
  echo "a"
#+end_src

#+RESULTS:
: a

#+begin_src sh :session s1
  echo "a"
#+end_src

#+RESULTS:
: a

#+begin_src sh :session s1 :async
  echo "a"
#+end_src

#+RESULTS:
: 7adf9461-2964-48b3-9c90-2ffecfd593be

#+begin_src sh :session :async
  echo "a"
#+end_src

#+RESULTS:
: a

As you can see, everything works till I combine a named session with async. A session without a name doesn't maintain variables, etc. So it doesn't work for my use-case. I've tried with zsh and bash, but they don't change anything. In theory, it should work, as seen in the tutorial

Answer 1

The problem solved itself after restarting emacs.

I think it might have been a problem with elpaca, because if I didn't install ob-async myself it wouldn't work.