[BUG] Markdown export of description list with nested list [9.5.2 (release_9.5.2-25-gaf6f12 @ /usr/local/share/emacs/28.1/lisp/org/)]

[Vangelis Evangelou <evangelou@gmail.com>]

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The following example is not exported correctly to markdown.

- description item 1 ::
  + list 1
  + list 2
- description item 2 ::
  + list 3
  + list 4

The example consists of a description list, where each item is described
by a list. There is no text following ::. Calling
org-md-export-as-markdown gives me

-   **description item 1:** -   list 1
    -   list 2
-   **description item 2:** -   list 3
    -   list 4

when instead should give

-   **description item 1:**
    -   list 1
    -   list 2
-   **description item 2:**
    -   list 3
    -   list 4

The example is exported to html correctly.

Emacs  : GNU Emacs 28.1 (build 1, x86_64-pc-linux-gnu, X toolkit,
cairo version 1.16.0, Xaw3d scroll bars)
 of 2022-04-09
Package: Org mode version 9.5.2 (release_9.5.2-25-gaf6f12 @
/usr/local/share/emacs/28.1/lisp/org/)