Attach (recommended) or Link to PDF file here:
[PATTYP2.pdf](https://github.com/mozilla/pdf.js/files/6471935/PATTYP2.pdf)

Configuration:
- Web browser and its version: FF 88.0.1
- Operating system and its version: W10.0.19042.985
- PDF.js version: https://mozilla.github.io/pdf.js/web/viewer.html

Steps to reproduce the problem:
1. open file to display

What is the expected behavior? (add screenshot)
![grafik](https://user-images.githubusercontent.com/6665575/118114800-5e407800-b3e8-11eb-860f-019f48a8eabf.png)

What went wrong? (add screenshot)
![grafik](https://user-images.githubusercontent.com/6665575/118114841-6c8e9400-b3e8-11eb-8252-1517e5d76475.png)

(memo for me: when fixed, check the files in https://issues.apache.org/jira/browse/PDFBOX-1958 )

ctx.save();
          ctx.strokeStyle = strokeColor.getPattern(ctx, this);
          
          ctx.lineWidth = Math.max(lineWidth, this.current.lineWidth);
          ctx.stroke();
          ctx.restore();
        } else {
          const lineWidth = this.getSinglePixelWidth();
          if (lineWidth < 0 && -lineWidth >= this.current.lineWidth) {
            
            
            ctx.save();
            ctx.resetTransform();
            ctx.lineWidth = Math.round(this._combinedScaleFactor);
            ctx.stroke();
            ctx.restore();
          } else {
            
            ctx.lineWidth = Math.max(lineWidth, this.current.lineWidth);
            ctx.stroke();
          }
        }
      }
      if (consumePath) {
        this.consumePath();
      }
      
      ctx.globalAlpha = this.current.fillAlpha;
    }
    closeStroke() {