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.

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  }
  /**
   * Cancel rendering of the textLayer.
   */
  cancel() {
    this._canceled = true;
    if (this._reader) {
      this._reader
        .cancel(new AbortException("TextLayer task cancelled."))
        .catch(() => {
          
        });
      this._reader = null;
    }
    if (this._renderTimer !== null) {
      clearTimeout(this._renderTimer);
      this._renderTimer = null;
    }
    this._capability.reject(new Error("TextLayer task cancelled."));
  }
  /**
   * @private
   */
  _processItems(items, styleCache) {