empty fo-block in table cells not rendering

Hi,

I have the following in a fo file.  I would expect the table to render a
cell that effectively has 5 lines.  Instead it renders a table cell with
only 2 lines, that is, it ignores the empy blocks.

If I duplicate the blocks in the same fo file, but outside of a table, it
renders 5 lines as expected.  Any idea why this might be and how I can get
the cell to render the empty blocks.


 <fo:table-cell display-align="center" padding="1pt"
border-right-color="black" border-right-style="solid"
border-top-width="0.75pt" border-top-color="black"
border-right-width="0.75pt" border-top-style="solid">
  <fo:block font-family="Helvetica" font-size="12pt" />
  <fo:block font-family="Helvetica" font-size="12pt">555</fo:block>
  <fo:block font-family="Helvetica" font-size="12pt" />
  <fo:block font-family="Helvetica" font-size="12pt">555</fo:block>
  <fo:block font-family="Helvetica" font-size="12pt" space-after="0.05pt" />
  </fo:table-cell>

TIA,

Mark


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