Example of doc4jx PDF conversion losing text formatting (like bold)

Docx4jFormatBug.java

import java.io.OutputStream;

import org.docx4j.convert.out.pdf.viaXSLFO.PdfSettings;
import org.docx4j.fonts.BestMatchingMapper;
import org.docx4j.fonts.IdentityPlusMapper;
import org.docx4j.fonts.Mapper;
import org.docx4j.fonts.PhysicalFont;
import org.docx4j.fonts.PhysicalFonts;
import org.docx4j.jaxb.Context;
import org.docx4j.openpackaging.packages.WordprocessingMLPackage;
import org.docx4j.openpackaging.parts.WordprocessingML.MainDocumentPart;
import org.docx4j.wml.BooleanDefaultTrue;
import org.docx4j.wml.ObjectFactory;
import org.docx4j.wml.P;
import org.docx4j.wml.R;
import org.docx4j.wml.RPr;
import org.docx4j.wml.Text;

public class Docx4jFormatBug {
	public static void main(String[] args) throws Exception {
		WordprocessingMLPackage docPackage = WordprocessingMLPackage
				.createPackage();

		MainDocumentPart document = docPackage.getMainDocumentPart();

		ObjectFactory factory = Context.getWmlObjectFactory();
		P para = factory.createP();

		// Add a bold run
		Text boldText = factory.createText();
		boldText.setValue("This should be bold");

		R boldRun = factory.createR();
		boldRun.getContent().add(boldText);
		RPr runProps = factory.createRPr();
		runProps.setB(new BooleanDefaultTrue());
		boldRun.setRPr(runProps);

		para.getContent().add(boldRun);

		// Add a plain-text run
		Text plainText = factory.createText();
		plainText.setValue(", and this should be plain");

		R plainRun = factory.createR();
		plainRun.getContent().add(plainText);

		para.getContent().add(plainRun);

		document.addObject(para);

		// Write as a docx; this works correctly
		docPackage.save(new java.io.File("formatted_text_bug.docx"));

		//Mapper fontMapper = new IdentityPlusMapper();
		Mapper fontMapper = new BestMatchingMapper();
	    	docPackage.setFontMapper(fontMapper);
		PhysicalFont font = PhysicalFonts.getPhysicalFonts().get("Arial");
		fontMapper.getFontMappings().put("Calibri", font);
		
		org.docx4j.convert.out.pdf.PdfConversion c = new org.docx4j.convert.out.pdf.viaXSLFO.Conversion(
				docPackage);

		// Convert to PDF and write; this has no formatting
		OutputStream os = new java.io.FileOutputStream("formatted_text_bug.pdf");

		c.output(os, new PdfSettings());
	}

}