The ob-shell async result output contains the shell prompt. I think it
should not be captured.

#+begin_src shell :session "test2" :async t
sleep 30
echo "hello, world"
#+end_src

#+RESULTS[(2023-03-23 11:19:22) 461ed5de684f6e619890709175ec73e80b67b2d6]:
: bash-5.2$ hello, world

-- 

[ stardiviner ]
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