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):

stringToBytes,
  stringToUTF8String,
} from "../../src/shared/util.js";
import { createIdFactory, XRefMock } from "./test_utils.js";
import { Dict, Name, Ref, RefSetCache } from "../../src/core/primitives.js";
import { Lexer, Parser } from "../../src/core/parser.js";
import { PartialEvaluator } from "../../src/core/evaluator.js";
import { StringStream } from "../../src/core/stream.js";
import { WorkerTask } from "../../src/core/worker.js";
describe("annotation", function () {
  class PDFManagerMock {
    constructor(params) {
      this.docBaseUrl = params.docBaseUrl || null;
      this.pdfDocument = {
        catalog: {
          acroForm: new Dict(),
        },
      };
    }
    ensure(obj, prop, args) {
      return new Promise(function (resolve) {
        const value = obj[prop];
        if (typeof value === "function") {
          resolve(value.apply(obj, args));
        } else {
          resolve(value);
        }
      });
    }
    ensureCatalog(prop, args) {