[FOP] Cannot add cropped pdf as fo:external-graphic

My original pdf (created by printing to PDF Creator (http://www.pdfforge.org/pdfcreator) works as an external graphic in test.fo. This PDF has 1-inch borders which I removed using Briss (http://briss.sourceforge.net/). The cropped PDF image is not displayed in test.pdf. I think that it is present but invisible because when I look at the document's properties (Fonts), I see two fonts but lorem_cropped.pdf has 1 font.

To reproduce:
<!-- BEGIN test.fo -->
<?xml version="1.0"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="A4-portrait" page-height="29.7cm" page-width="21.0cm" margin="2cm">
      <fo:region-body/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="A4-portrait">
    <fo:flow flow-name="xsl-region-body">
      <fo:block>
            Hello, World!
      </fo:block>
      <fo:block>
        <fo:external-graphic src="lorem_cropped.pdf" /> <!-- External graphic here -->
      </fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>
<!-- END test.fo -->

lorem.pdf is a "Lorem ipsum" paragraph printed to PDF Creator on letter
 size paper.
lorem_cropped.pdf is lorem.pdf cropped to contain just the paragraph
with minimal whitespace.
test.pdf is the output of
C:\>fop test.fo test.pdf

I am using fop SVN r1768353 (2016-10-20 17:03:59 -0500) and the fop
PDF Images plugin from
https://dist.apache.org/repos/dist/dev/xmlgraphics/binaries/ on
Windows 10.

Regards,
John Brown.


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