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):

cff.duplicateFirstGlyph();
          var compiler = new CFFCompiler(cff);
          tables["CFF "].data = compiler.compile();
        } catch (e) {
          warn("Failed to compile font " + properties.loadedName);
        }
      }
      
      if (!tables.name) {
        tables.name = {
          tag: "name",
          data: createNameTable(this.name),
        };
      } else {
        
        var namePrototype = readNameTable(tables.name);
        tables.name.data = createNameTable(name, namePrototype);
      }
      var builder = new OpenTypeFileBuilder(header.version);
      for (var tableTag in tables) {
        builder.addTable(tableTag, tables[tableTag].data);
      }
      return builder.toArray();
    },
    convert: function Font_convert(fontName, font, properties) {
      
      properties.fixedPitch = false;
      if (properties.builtInEncoding) {