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):

idFactoryMock
      ).then(({ data }) => {
        ta.annotationType).toEqual(AnnotationType.WIDGET);
        ta.fieldName).toEqual("foo.bar.baz");
        done();
      }, done.fail);
    });
    it(
      "should construct the field name if a parent is not a dictionary " +
        "(issue 8143)",
      function (done) {
        const parentDict = new Dict();
        parentDict.set("Parent", null);
        parentDict.set("T", "foo");
        widgetDict.set("Parent", parentDict);
        widgetDict.set("T", "bar");
        const widgetRef = Ref.get(22, 0);
        const xref = new XRefMock([{ ref: widgetRef, data: widgetDict }]);
        AnnotationFactory.create(
          xref,
          widgetRef,
          pdfManagerMock,
          idFactoryMock
        ).then(({ data }) => {
          ta.annotationType).toEqual(AnnotationType.WIDGET);
          ta.fieldName).toEqual("foo.bar");
          done();
        }, done.fail);
      }
    );