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)

ps[ 0] = pi;     ps[ 1] = pi + 11; ps[ 2] = pi + 10; ps[ 3] = pi + 9;
          cs[2] = ci + 1; cs[3] = ci + 2;
          cs[0] = ci;     cs[1] = ci + 3;
          break;
        
        case 1:
          tmp1 = ps[12]; tmp2 = ps[13]; tmp3 = ps[14]; tmp4 = ps[15];
          ps[12] = tmp4;   ps[13] = pi + 0;  ps[14] = pi + 1;  ps[15] = pi + 2;
          ps[ 8] = tmp3;   ps[ 9] = pi + 9;  ps[10] = pi + 10; ps[11] = pi + 3;
          ps[ 4] = tmp2;   ps[ 5] = pi + 8;  ps[ 6] = pi + 11; ps[ 7] = pi + 4;
          ps[ 0] = tmp1;   ps[ 1] = pi + 7;  ps[ 2] = pi + 6;  ps[ 3] = pi + 5;
          tmp1 = cs[2]; tmp2 = cs[3];
          cs[2] = tmp2;   cs[3] = ci;
          cs[0] = tmp1;   cs[1] = ci + 1;
          break;
        
        case 2:
          tmp1 = ps[15];
          tmp2 = ps[11];
          ps[12] = ps[3]; ps[13] = pi + 0; ps[14] = pi + 1;  ps[15] = pi + 2;
          ps[ 8] = ps[7]; ps[ 9] = pi + 9; ps[10] = pi + 10; ps[11] = pi + 3;
          ps[ 4] = tmp2;  ps[ 5] = pi + 8; ps[ 6] = pi + 11; ps[ 7] = pi + 4;
          ps[ 0] = tmp1;  ps[ 1] = pi + 7; ps[ 2] = pi + 6;  ps[ 3] = pi + 5;
          tmp1 = cs[3];
          cs[2] = cs[1]; cs[3] = ci;
          cs[0] = tmp1;  cs[1] = ci + 1;
          break;
        
        case 3:
          ps[12] = ps[0];  ps[13] = pi + 0;  ps[14] = pi + 1;  ps[15] = pi + 2;