[O] [Beamer] headings missing with two columns

[Loris Bennett]

Hi,

With the following:

#+TITLE: test
#+OPTIONS: H:3
#+LaTeX_CLASS: beamer
* blah
** test
*** Food                                                          :B_columns:
    :PROPERTIES:
    :BEAMER_env: columns
    :END:
**** Fruit                                                         :B_column:
     :PROPERTIES:
     :BEAMER_col: .5
     :BEAMER_env: column
     :END:
     - apple
     - banana
**** Vegetables                                                    :B_column:
     :PROPERTIES:
     :BEAMER_col: .5
     :BEAMER_env: column
     :END:
     - artichoke
     - broccoli

I expected to see headings "Fruit" and "Vegetables" over the two
columns, but they do not appear.  I thought I had to use

    :BEAMER_env: ignoreheading

explicitly to suppress the headings and that the default was to show
them. 

What am I doing wrong?

Cheers,

Loris

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