[:results append] and [:wrap ...] don't play well together

[Greg Minshall <minshall@umich.edu>]

hi.  this fails with [emacs -Q], which in my case
: Org mode version 9.4.4 (release_9.4.4 @ /usr/share/emacs/27.2/lisp/org/)

and, also in whatever elpa'ish version i'm running
: Org mode version 9.4.4 (release_9.4.4-277-g2e1c98 @ /home/minshall/.emacs.d/straight/build/org/)

when i specify [:results append] and also [:wrap foo], the results are
not obviously appended.  below it seems as if the second evaluation is
appended, then the following are prepended after the first one?

cheers, Greg

#+begin_src elisp :results none
  (org-babel-do-load-languages
   'org-babel-load-languages
   '((emacs-lisp . t) (R . t)))
#+end_src

#+begin_src R :results append :wrap foo
Sys.time()
#+end_src

#+RESULTS:
#+begin_foo
2021-03-31 05:51:08
#+end_foo
#+begin_foo
2021-03-31 05:51:15
#+end_foo
#+begin_foo
2021-03-31 05:51:12
#+end_foo
#+begin_foo
2021-03-31 05:51:10
#+end_foo