Attach (recommended) or Link to PDF file here:
[PATTYP2.pdf](https://github.com/mozilla/pdf.js/files/6471935/PATTYP2.pdf)

Configuration:
- Web browser and its version: FF 88.0.1
- Operating system and its version: W10.0.19042.985
- PDF.js version: https://mozilla.github.io/pdf.js/web/viewer.html

Steps to reproduce the problem:
1. open file to display

What is the expected behavior? (add screenshot)
![grafik](https://user-images.githubusercontent.com/6665575/118114800-5e407800-b3e8-11eb-860f-019f48a8eabf.png)

What went wrong? (add screenshot)
![grafik](https://user-images.githubusercontent.com/6665575/118114841-6c8e9400-b3e8-11eb-8252-1517e5d76475.png)

(memo for me: when fixed, check the files in https://issues.apache.org/jira/browse/PDFBOX-1958 )

getPattern() {
    return "hotpink";
  }
}
function getShadingPattern(IR) {
  switch (IR[0]) {
    case "RadialAxial":
      return new RadialAxialShadingPattern(IR);
    case "Mesh":
      return new MeshShadingPattern(IR);
    case "Dummy":
      return new DummyShadingPattern();
  }
  throw new Error(`Unknown IR type: ${IR[0]}`);
}
const PaintType = {
  COLORED: 1,
  UNCOLORED: 2,
};
class TilingPattern {
  
  static get MAX_PATTERN_SIZE() {
    return shadow(this, "MAX_PATTERN_SIZE", 3000);
  }
  constructor(IR, color, ctx, canvasGraphicsFactory, baseTransform) {