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):

unicode = String.fromCharCode(unicode);
      }
      var isInFont = charcode in this.toFontChar;
      
      
      fontCharCode = this.toFontChar[charcode] || charcode;
      if (this.missingFile) {
        const glyphName =
          this.differences[charcode] || this.defaultEncoding[charcode];
        if (
          (glyphName === ".notdef" || glyphName === "") &&
          this.type === "Type1"
        ) {
          
          
          fontCharCode = 0x20;
        }
        fontCharCode = mapSpecialUnicodeValues(fontCharCode);
      }
      if (this.isType3Font) {
        
        operatorListId = fontCharCode;
      }
      var accent = null;
      if (this.seacMap && this.seacMap[charcode]) {
        isInFont = true;
        var seac = this.seacMap[charcode];
        fontCharCode = seac.baseFontCharCode;
        accent = {
          fontChar: String.fromCodePoint(seac.accentFontCharCode),