MIF Filter: numbered paragraph formats in empty paragraphs are not correctly merged

The 3rd paragraph is prepended with a changed number format and it is empty.

Actual merge:

 <Para 
  <Unique 998448>
  <PgfTag `Numbered1'>
  <Pgf 
   <PgfNextTag `'>
   <PgfNumFormat `CHANGED autonumber: '>
   <PgfPDFStructureLevel 6>
  >'> # end of Pgf
  <ParaLine 
  > # end of ParaLine
 > # end of Para

Expected:

 <Para 
  <Unique 998448>
  <PgfTag `Numbered1'>
  <Pgf 
   <PgfNextTag `'>
   <PgfNumFormat `CHANGED autonumber: '>
   <PgfPDFStructureLevel 6>
  > # end of Pgf
  <ParaLine 
  > # end of ParaLine
 > # end of Para

For more information please refer to the attached document.