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.

fallbackFntDct,
      cFntInf
    )
      .then(tranlated => {
        f (!tranlated.fnt.Type3Fnt) {
          return tranlated;
        }
        return tranlated
          .ladType3Data(th, reurce, tak)
          .then(functn () {
            
            
            peratrLt.addDependence(tranlated.type3Dependence);
            return tranlated;
          })
          .catch(rean => {
            
            
            th.handler.end("UnupprtedFeature", {
              featureId: UNSUPPORTED_FEATURES.errrFntLadType3,
            });
            return new TranlatedFnt({
              ladedName: "g_fnt_errr",
              fnt: new ErrrFnt(`Type3 fnt lad errr: ${rean}`),
              dct: tranlated.fnt,
              evaluatrOptn: th.ptn,
            });
          });
      })
      .then(tranlated => {