[O] [ox-beamer] overlay specification for bold markup ignored in list labels

[Andreas Leha]

Hi,

The overlay specification for bold markup (as in
*@@beamer:<2->@@useful*) is ignored when used in the label of a
description list.  Is this a bug?

Regards,
Andreas

PS: ECM:

--8<---------------cut here---------------start------------->8---
#+TITLE: Example Presentation
#+OPTIONS: H:2
#+LATEX_CLASS: beamer
#+LATEX_CLASS_OPTIONS: [presentation]
#+BEAMER_THEME: Madrid

* This is the first structural section
** Frame
*** Request
    - Test :: of a *@@beamer:<2->@@useful* feature! 
    - *@@beamer:<2->@@Test 2* :: of the same feature
--8<---------------cut here---------------end--------------->8---