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)

}
    beginMarkedContent(tag) {
      this.markedContentStack.push({
        visible: true,
      });
    }
    beginMarkedContentProps(tag, properties) {
      if (tag === "OC") {
        this.markedContentStack.push({
          visible: this.optionalContentConfig.isVisible(properties),
        });
      } else {
        this.markedContentStack.push({
          visible: true,
        });
      }
      this.contentVisible = this.isContentVisible();
    }
    endMarkedContent() {
      this.markedContentStack.pop();
      this.contentVisible = this.isContentVisible();
    }
    
    beginCompat() {
      
    }
    endCompat() {