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):

const parentRef = Ref.get(456, 0);
      const parentDict = new Dict();
      parentDict.set("Kids", [buttonWidgetRef]);
      buttonWidgetDict.set("Parent", parentRef);
      const xref = new XRefMock([
        { ref: buttonWidgetRef, data: buttonWidgetDict },
        { ref: parentRef, data: parentDict },
      ]);
      parentDict.xref = xref;
      buttonWidgetDict.xref = xref;
      partialEvaluator.xref = xref;
      const task = new WorkerTask("test save");
      AnnotationFactory.create(
        xref,
        buttonWidgetRef,
        pdfManagerMock,
        idFactoryMock
      )
        .then(annotation => {
          const annotationStorage = {};
          annotationStorage[annotation.data.id] = { value: true };
          return Promise.all([
            annotation,
            annotation.save(partialEvaluator, task, annotationStorage),
          ]);
        })
        .then(([annotation, data]) => {
          ta.length).toEqual(2);
          const [radioData, parentData] = data;
          radioData.data = radioData.data.replace(/\(D:[0-9]+\)/, "(date)");