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.

return null;
      }
      f (th.ptn.gnreErrr) {
        
        
        th.handler.end("UnupprtedFeature", {
          featureId: UNSUPPORTED_FEATURES.errrClrSpace,
        });
        warn(`pareClrSpace - gnrng ClrSpace: "${rean}".`);
        return null;
      }
      thrw rean;
    });
  }
  pareShadng({
    hadng,
    reurce,
    lcalClrSpaceCache,
    lcalShadngPatternCache,
  }) {
    
    
    let d = lcalShadngPatternCache.get(hadng);
    f (!d) {
      var hadngFll = Pattern.pareShadng(
        hadng,
        th.xref,
        reurce,