Frame: rounded corners not correct

<?xml version="1.0" encoding="UTF-8"?>
<Layout 
  xmlns="urn:speedata.de:2009/publisher/en" 
  xmlns:sd="urn:speedata:2009/publisher/functions/en">

  <DefineColor name="red" value="#f00"/>
  <DefineColor name="blue" value="#00f"/>

  <Pageformat width="5cm" height="5cm"/>

  <Record element="data">
    <PlaceObject>
      <Frame backgroundcolor="red" framecolor="black" rulewidth="5pt" border-bottom-right-radius="3pt" border-bottom-left-radius="10pt">
        <Table padding="1cm">
          <Tr><Td><Paragraph color="red"><Value>foobar</Value></Paragraph></Td></Tr></Table>
      </Frame>
    </PlaceObject>
  </Record>
</Layout>

yields

frame-broken

but instead I expect something like this (HTML)

frame-ok

speedata / publisher

Frame: rounded corners not correct #47