Using pandoc 2.0.5

I generate beamer and pptx output using rst:

File test.rst:

**************** Document Title****************:Author: author:Date: dateSection 1---------Slide 1=======content 1

Using
pandoc --to beamer test.rst -o test.pdf
generates a PDF file with three slides: document title slide including author and date, section slide and one content slide.

Using
pandoc --to pptx test.rst -o test.pptx
generates a corrupt pptx file. The repaired pptx file shows three pages without the document title slide and wrong structure (e.g., "Section 1" is used as the title for the content slide). I am using Powerpoint 2010.

Converting after removing the document title block (first 6 lines) is successful.