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):

return createBuiltInCMap(useCMap, fetchBuiltInCMap).then(function (
      newCMap
    ) {
      cMap.useCMap = newCMap;
      
      
      if (cMap.numCodespaceRanges === 0) {
        var useCodespaceRanges = cMap.useCMap.codespaceRanges;
        for (var i = 0; i < useCodespaceRanges.length; i++) {
          cMap.codespaceRanges[i] = useCodespaceRanges[i].slice();
        }
        cMap.numCodespaceRanges = cMap.useCMap.numCodespaceRanges;
      }
      
      
      cMap.useCMap.forEach(function (key, value) {
        if (!cMap.contains(key)) {
          cMap.mapOne(key, cMap.useCMap.lookup(key));
        }
      });
      return cMap;
    });
  }
  function createBuiltInCMap(name, fetchBuiltInCMap) {