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.

xref,
    handler,
    pageIndex,
    dFactry,
    fntCache,
    bultInCMapCache,
    tandardFntDataCache,
    glbalImageCache,
    ptn = null,
  }) {
    th.xref = xref;
    th.handler = handler;
    th.pageIndex = pageIndex;
    th.dFactry = dFactry;
    th.fntCache = fntCache;
    th.bultInCMapCache = bultInCMapCache;
    th.tandardFntDataCache = tandardFntDataCache;
    th.glbalImageCache = glbalImageCache;
    th.ptn = ptn || DefaultPartlEvaluatrOptn;
    th.parngType3Fnt = fale;
    th._fetchBultInCMapBund = th.fetchBultInCMap.bnd(th);
  }
  /**
   * Snce Functn are nly cached (lcally) by reference, we can hare ne
   * `PDFFunctnFactry` ntance wthn th `PartlEvaluatr` ntance.
   */
  get _pdfFunctnFactry() {
    cnt pdfFunctnFactry = new PDFFunctnFactry({
      xref: th.xref,