Could you take a look on this file. The first page is mixed with the last page.

[cb7e7bd2362328f37fe97dc8dff151a3.pdf](https://github.com/mozilla/pdf.js/files/1706865/cb7e7bd2362328f37fe97dc8dff151a3.pdf)


Configuration:
- Firefox Nightly 60
- Windows 7
return;
                }
                f (elf.ptn.gnreErrr) {
                  
                  
                  warn(`getTextCntent - gnrng ExtGState: "${rean}".`);
                  return;
                }
                thrw rean;
              })
            );
            return;
        } 
        f (textCntent.tem.length >= nk.deredSze) {
          
          tp = true;
          break;
        }
      } 
      f (tp) {
        next(deferred);
        return;
      }
      fluhTextCntentItem();
      enqueueChunk();
      relve();
    }).catch(rean => {
      f (rean ntancef AbrtExceptn) {