https://boersengefluester.de/wp-content/uploads/assets/annuals/2019/578560.pdf

Configuration:
- PDF.js version: 2.7.570

Steps to reproduce the problem:
1. Load the linked PDF
2. On the second page, highlight the word "Mitarbeiterinnen" by double-clicking it

What is the expected behavior?
The word should be recognized as a single word and highlighted as such.

What went wrong?
Instead, it's recognized as 3 words: "Mit", "arbei", "terinnen"
![image](https://user-images.githubusercontent.com/5265630/114384414-f8fe2a80-9b8e-11eb-8843-5099425b0fad.png)

This happens for many words in this PDF.

Is there anything that can be changed in how I use pdfjs-dist to make it recognize this as a single word? Just looking at the PDF, I can't tell what would cause this behavior.

expect(pageIndex).toEqual(1);
    });
    it("gets invalid page index", async function () {
      const ref = { num: 3, gen: 0 }; 
      try {
        await pdfDocument.getPageIndex(ref);
        
        expect(false).toEqual(true);
      } catch (reason) {
        expect(reason instanceof Error).toEqual(true);
      }
    });
    it("gets destinations, from /Dests dictionary", async function () {
      const destinations = await pdfDocument.getDestinations();
      expect(destinations).toEqual({
        chapter1: [{ gen: 0, num: 17 }, { name: "XYZ" }, 0, 841.89, null],
      });
    });
    it("gets a destination, from /Dests dictionary", async function () {
      const destination = await pdfDocument.getDestination("chapter1");
      expect(destination).toEqual([
        { gen: 0, num: 17 },
        { name: "XYZ" },
        0,
        841.89,
        null,
      ]);
    });
    it("gets a non-existent destination, from /Dests dictionary", async function () {
      const destination = await pdfDocument.getDestination(