Attach (recommended) or Link to PDF file here:

Configuration:
- Web browser and its version: Chrome 90.0.4430.93
- Operating system and its version: macOs Big Sur 11.2.3
- PDF.js version: 2.7.570
- Is a browser extension: No

Steps to reproduce the problem:
1. Load the attached pdf in https://mozilla.github.io/pdf.js/web/viewer.html
2. Go to page 46. Dotted lines are missing in the graphics (see screenshot from acrobat reader)

What is the expected behavior? (add screenshot) See the screenshot
[Technical_Guide_UK.pdf](https://github.com/mozilla/pdf.js/files/6413001/Technical_Guide_UK.pdf)
![Screenshot 2021-05-03 at 07 46 09](https://user-images.githubusercontent.com/3785784/116844541-a343fd80-abe3-11eb-94c3-d03b3dfd6769.png)

this.ctx.closePath();
    }
    stroke(consumePath) {
      consumePath = typeof consumePath !== "undefined" ? consumePath : true;
      const ctx = this.ctx;
      const strokeColor = this.current.strokeColor;
      
      
      ctx.globalAlpha = this.current.strokeAlpha;
      if (this.contentVisible) {
        if (typeof strokeColor === "object" && strokeColor?.getPattern) {
          
          
          ctx.save();
          
          
          
          
          const transform = ctx.mozCurrentTransform;
          const scale = Util.singularValueDecompose2dScale(transform)[0];
          ctx.strokeStyle = strokeColor.getPattern(ctx, this);
          const lineWidth = this.getSinglePixelWidth();
          const scaledLineWidth = this.current.lineWidth * scale;
          if (lineWidth < 0 && -lineWidth >= scaledLineWidth) {
            ctx.resetTransform();
            ctx.lineWidth = Math.round(this._combinedScaleFactor);
          } else {
            ctx.lineWidth = Math.max(lineWidth, scaledLineWidth);
          }