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)

} catch (ex) {
      if (ex instanceof MissingDataException) {
        throw ex;
      }
      handler.send("UnsupportedFeature", {
        featureId: UNSUPPORTED_FEATURES.shadingPattern,
      });
      warn(ex);
      return new Shadings.Dummy();
    }
  };
  return Pattern;
})();
const Shadings = {};
Shadings.SMALL_NUMBER = 1e-6;
Shadings.RadialAxial = (function RadialAxialClosure() {
  function RadialAxial(
    dict,
    matrix,
    xref,
    resources,
    pdfFunctionFactory,
    localColorSpaceCache
  ) {
    this.matrix = matrix;
    this.coordsArr = dict.getArray("Coords");
    this.shadingType = dict.get("ShadingType");
    this.type = "Pattern";
    const cs = ColorSpace.parse({
      cs: dict.getRaw("ColorSpace") || dict.getRaw("CS"),