vreference="bottom" fails

[pgundlach]

<Layout
  xmlns="urn:speedata.de:2009/publisher/en"
  xmlns:sd="urn:speedata:2009/publisher/functions/en">

  <Trace grid="yes" gridallocation="yes"/>
  <Pageformat height="7cm" width="7cm"/>

  <SetGrid nx="2" height="8pt"/>

  <DefineFontfamily name="6/8" fontsize="6" leading="8">
    <Regular fontface="sans"/>
  </DefineFontfamily>


  <Record element="data">
    <PlaceObject column="1" row="{sd:number-of-rows()}" vreference="bottom" valign="bottom" frame="solid">
      <Table fontface="6/8" stretch="max" >
        <Columns>
          <Column width="1*"/>
          <Column width="1*"/>
        </Columns>
        <Tr valign="top">
          <Td><Paragraph><Value>a</Value></Paragraph></Td>
          <Td><Paragraph><Value>a</Value><Br/><Value>b</Value><Br/><Value>c</Value></Paragraph></Td>
        </Tr>
      </Table>
    </PlaceObject>
  </Record>
</Layout>

Is misaligned: