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)

stream,
    matrix,
    xref,
    resources,
    pdfFunctionFactory,
    localColorSpaceCache
  ) {
    if (!isStream(stream)) {
      throw new FormatError("Mesh data is not a stream");
    }
    const dict = stream.dict;
    this.matrix = matrix;
    this.shadingType = dict.get("ShadingType");
    this.type = "Pattern";
    const bbox = dict.getArray("BBox");
    if (Array.isArray(bbox) && bbox.length === 4) {
      this.bbox = Util.normalizeRect(bbox);
    } else {
      this.bbox = null;
    }