Attach (recommended) or Link to PDF file here:
https://www.nta.go.jp/taxes/tetsuzuki/shinsei/annai/joyaku/annai/pdf2/250.pdf

Configuration:
- Web browser and its version: Firefox 81.0a1
- Operating system and its version: Debian 5.6.7-1
- PDF.js version: latest in Firefox nightly
- Is a browser extension: No

Steps to reproduce the problem:
1. Open the pdf and paste the following text "本 店 又 は 主 た る 事 務 所 の 所 在 地" in "Full name" and in "Domicile and residence" textfields
2. Print or Save the pdf 

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/5641725/91207547-30f05480-e709-11ea-9abd-2af5d970dc46.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/5641725/91207663-69902e00-e709-11ea-8a1d-1ddd30cf0621.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

AnnotationFactory.create(
        xref,
        textWidgetRef,
        pdfManagerMock,
        idFactoryMock
      )
        .then(annotation => {
          const annotationStorage = {};
          annotationStorage[annotation.data.id] = { value: "hello world" };
          return annotation.save(partialEvaluator, task, annotationStorage);
        }, done.fail)
        .then(data => {
          ta.length).toEqual(2);
          const [oldData, newData] = data;
          expect(oldData.ref).toEqual(Ref.get(123, 0));
          expect(newData.ref).toEqual(Ref.get(1, 0));
          oldData.data = oldData.data.replace(/\(D:[0-9]+\)/, "(date)");
          expect(oldData.data).toEqual(
            "123 0 obj\n" +
              "<< /Type /Annot /Subtype /Widget /FT /Tx /DA (/Helv 5 Tf) /DR " +
              "<< /Font << /Helv 314 0 R>>>> /Rect [0 0 32 10] " +
              "/V (hello world) /AP << /N 1 0 R>> /M (date)>>\nendobj\n"
          );
          expect(newData.data).toEqual(
            "1 0 obj\n<< /Length 77 /Subtype /Form /Resources " +
              "<< /Font << /Helv 314 0 R>>>> /BBox [0 0 32 10]>> stream\n" +
              "/Tx BMC q BT /Helv 5 Tf 1 0 0 1 0 0 Tm 2.00 2.00 Td (hello world) Tj " +
              "ET Q EMC\nendstream\nendobj\n"
          );
          done();