ob-async

[Roger Mason]

Hello,

I installed ob-async from MELPA.  It does not seem to work.  For example
the following simple source block is run synchronously, i.e., emacs
shows the cursor as a watch and it is not possible to move point, or to
type, until the source block completes.

#+begin_src ruby :tangle test.rb
sleep 30
puts "Hello World"
#+end_src

#+begin_src sh :results output :async
ruby test.rb
#+end_src

#+RESULTS:
: Hello World


Is ob-async known to be broken?  I'm using

GNU Emacs 27.2 (build 1, amd64-portbld-freebsd12.2, X toolkit, cairo version 
1.17.4, Xaw3d scroll bars)
Org mode version 9.5.4 (release_9.5.4-602-g381a2a.dirty @ 
/home/rmason/.emacs.d/org-git/lisp/)

Thanks for any help.
Roger