allowframebreaks in beamer export

[Rafael <rvf0068@gmail.com>]

I would like to export to beamer, in such a way that all frames have
the 'allowframebreaks' option. I thought the following would work, but
when I export, the frames in the .tex file have no
allowframebreaks. Maybe I am misunderstanding the way that properties
are inherited, so my question is: is there a way to have all frames
with allowframebreaks option, without having to declare explicitly the
'BEAMER_OPT' property in all frame subheadings?

#+BEGIN_SRC org
,#+title: Presentation
,#+latex_header: \usepackage{lipsum}
,#+options: H:2

,* A part
  :PROPERTIES:
  :BEAMER_OPT: allowframebreaks=0.8
  :END:

,** First
   \lipsum[1-2]
  
,** Second
   \lipsum[3-4]

,* COMMENT Local Variables

# Local Variables:
# org-use-property-inheritance: t
# End:
#+END_SRC

(BTW, I know and understand when the beamer manual says that the
'allowframebreaks' option is evil, but in this case I want to produce
reading notes only for my use, and I find that beamer export is rather
convenient.)