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):

"123 0 obj\n" +
              "<< /Type /Annot /Subtype /Widget /FT /Btn /Ff 32768 " +
              "/AP << /N << /Checked 314 0 R /Off 271 0 R>>>> " +
              "/Parent 456 0 R /AS /Checked /M (date)>>\nendobj\n"
          );
          expect(parentData.ref).toEqual(Ref.get(456, 0));
          expect(parentData.data).toEqual(
            "456 0 obj\n<< /V /Checked /Kids [123 0 R]>>\nendobj\n"
          );
          return annotation;
        }, done.fail)
        .then(annotation => {
          const annotationStorage = {};
          annotationStorage[annotation.data.id] = { value: false };
          return annotation.save(partialEvaluator, task, annotationStorage);
        }, done.fail)
        .then(data => {
          ta).toEqual(null);
          done();
        }, done.fail);
    });
    it("should save radio buttons without a field value", function (done) {
      const appearanceStatesDict = new Dict();
      const normalAppearanceDict = new Dict();
      normalAppearanceDict.set("Checked", Ref.get(314, 0));
      normalAppearanceDict.set("Off", Ref.get(271, 0));
      appearanceStatesDict.set("N", normalAppearanceDict);
      buttonWidgetDict.set("Ff", AnnotationFieldFlag.RADIO);
      buttonWidgetDict.set("AP", appearanceStatesDict);
      const buttonWidgetRef = Ref.get(123, 0);