Rendering a document with filled form fields using PDFBox works with 1.8.2, but not 2.0.2

问题

My goal is to open a PDF document, fill in some form fields and then render it to an image. I'm using PDFBox with Java to do it. I started using version 2.0.2 (latest) and filling the form fields works. When I save it and then open it with a PDF reader, the form fields have values. But when I render it to an image, the form fields have black borders and no text inside. I then tried the same thing with 1.8.12 and it works. However, I would really like to use the new features in 2.x.

The PDF only has AcroForms, no XFA (or at least I think so). When I call PDAcroForm.getXFA() it returns null.
Using 2.0.2, if I'm rendering something filled using setValue, then the rendering looks broken. However, rendering something filled using Adobe Reader works. Both cases work using 1.8.
With 2.0.2 I tried any combination of PDAcroForm.refreshAppearances() and/or PDAcroForm.setNeedAppearances(true). Those methods are absent in 1.8.

The code I'm using to render using 1.8.12:

public class Main {
    public static void main(String[] args) throws Exception {
        PDDocument doc = PDDocument.loadNonSeq(new File("test.pdf"), null);
        doc.setAllSecurityToBeRemoved(true);
        PDDocumentCatalog cat = doc.getDocumentCatalog();
        PDAcroForm form = cat.getAcroForm();
        for (Object _field : form.getFields()) {
            PDField field = (PDField) _field;
            System.out.println(field.getFullyQualifiedName());
            field.setValue(field.getFullyQualifiedName());
        }

        List<PDPage> pdPages = doc.getDocumentCatalog().getAllPages();
        int page = 0;
        for (PDPage pdPage : pdPages) {
            ++page;
            BufferedImage bim = pdPage.convertToImage(BufferedImage.TYPE_INT_RGB, 96);
            ImageIOUtil.writeImage(bim, "rendered" + "-" + page + ".png", 96);
        }
        doc.close();
    }
}

The code I'm using to render using 2.0.2:

public class Main {
    public static void main(String[] args) throws Exception {
        PDDocument doc = PDDocument.load(new File("test.pdf"));
        doc.setAllSecurityToBeRemoved(true);
        PDDocumentCatalog cat = doc.getDocumentCatalog();
        PDAcroForm form = cat.getAcroForm();
        for (PDField field : form.getFields()) {
            System.out.println(field.getFullyQualifiedName());
            if (field instanceof PDTextField) {
                field.setValue(field.getFullyQualifiedName());
            }
        }
        // Doesn't work with or without these
        form.setNeedAppearances(true);
        form.refreshAppearances();

        PDDocument renderDoc = doc;
        PDFRenderer pdfRenderer = new PDFRenderer(renderDoc);
        for (int page = 0; page < renderDoc.getNumberOfPages(); ++page) {
            BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 96,     ImageType.RGB);
            ImageIOUtil.writeImage(bim, "rendered" + "-" + (page + 1) +     ".png", 96);
        }
    }
}

Correct version rendered using 1.8.12:

Bad version rendered using 2.0.2: