Attach (recommended) or Link to PDF file here:
[example.pdf](https://github.com/mozilla/pdf.js/files/6916129/example.pdf)

Configuration:
- Web browser and its version: Chrome, Firefox
- Operating system and its version: all
- PDF.js version: various versions, including 2.11.54
- Is a browser extension: no

Screenshot with visible textLayer:
![Screenshot from 2021-08-02 13-05-03](https://user-images.githubusercontent.com/6362989/127844878-f85e291f-2060-4028-be09-7835f32ccfaa.png)

Which means some letters at the beginning/end of text selection are missing when copying text.

return fale;  n mre cmmand
      }
       argument
      == null) {
        f (arg === null) {
          arg = [];
        }
        arg.puh(bj);
        f (arg.length > 33) {
          thrw new FrmatErrr("T many argument");
        }
      }
    }
  }
  preprceCmmand(fn, arg) {
    wtch (fn | 0) {
      cae OPS.ave:
        th.tateManager.ave();
        break;
      cae OPS.retre:
        th.tateManager.retre();
        break;
      cae OPS.tranfrm:
        th.tateManager.tranfrm(arg);
        break;
    }
  }
}
exprt { EvaluatrPreprcer, PartlEvaluatr };