:cache and :results drawer don't get along?

[<tomas@tuxteam.de>]

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Hi, Org gurus

I'm using Org 9.1.9, as it comes with Emacs 27.0.50, freshly compiled
from sources.

I'm having a hard time referencing a cached result when it's in
a drawer (I like to wrap my results in a drawer).

Before I file a bug report, I'd make sure that I am not doing
something obviously stupid.

Best with an example:

* with drawer
  No cache, with drawer:

  #+NAME: with-drawer
  #+BEGIN_SRC emacs-lisp :results drawer
  42
  #+END_SRC

  #+RESULTS: with-drawer
  :RESULTS:
  42
  :END:

  #+NAME: check-with-drawer
  #+BEGIN_SRC emacs-lisp :var thing=with-drawer
  thing
  #+END_SRC

  #+RESULTS: check-with-drawer
  : 42

  So far, so good

* drawer and cache:
  Cached results in a drawer:

  #+NAME: cached-with-drawer
  #+BEGIN_SRC emacs-lisp :results drawer :cache yes
  42
  #+END_SRC

  #+RESULTS[4ba2e4b62c57298395b2f6f8d145dcc85264d192]: cached-with-drawer
  :RESULTS:
  42
  :END:

  #+NAME: check-cached-with-drawer
  #+BEGIN_SRC emacs-lisp :var thing=cached-with-drawer
  thing
  #+END_SRC

  #+RESULTS: check-cached-with-drawer
  : nil

Note how the variable is nil. I tested also :cache yes _without_ a
drawer, and then it works as expected.

Am I doing something stupid?

Thanks for any insights
-- tomás

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