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)

xref,
      resources,
      pdfFunctionFactory,
      localColorSpaceCache,
    });
    this.cs = cs;
    const bbox = dict.getArray("BBox");
    if (Array.isArray(bbox) && bbox.length === 4) {
      this.bbox = Util.normalizeRect(bbox);
    } else {
      this.bbox = null;
    }
    let t0 = 0.0,
      t1 = 1.0;
    if (dict.has("Domain")) {
      const domainArr = dict.getArray("Domain");
      t0 = domainArr[0];
      t1 = domainArr[1];
    }
    let extendStart = false,
      extendEnd = false;
    if (dict.has("Extend")) {
      const extendArr = dict.getArray("Extend");
      extendStart = extendArr[0];
      extendEnd = extendArr[1];
    }
    if (
      this.shadingType === ShadingType.RADIAL &&
      (!extendStart || !extendEnd)
    ) {