Attach (recommended) or Link to PDF file here: [A3_Quer.pdf](https://github.com/mozilla/pdf.js/files/7373152/A3_Quer.pdf)


**Configuration:**

- Web browser and its version: Firefox 93.0
- Operating system and its version: macOS 11.6
- PDF.js version: 2.5.207
- Is a browser extension: no

**Steps to reproduce the problem:**
1. Open the attached file in Firefox

We discovered this issue in on older version of this library, but it can be reproduced in the current version of Firefox.

**What is the expected behavior? (add screenshot)**
The file should be rendered with a linear gradient as a background:
![Bildschirmfoto 2021-10-19 um 14 34 00](https://user-images.githubusercontent.com/8649002/137910027-07947e34-700b-4692-b225-d38c36da0d37.png)


**What went wrong? (add screenshot)**
The file is rendered without any background:
![Bildschirmfoto 2021-10-19 um 14 35 05](https://user-images.githubusercontent.com/8649002/137910215-a6b8fb9e-ff95-49f0-93b4-c9f127bd49c1.png)



**Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):**
none
cs[2] = cs[0]; cs[3] = ci;
          cs[0] = cs[1]; cs[1] = ci + 1;
          break;
      }
      this.figures.push({
        type: "patch",
        coords: new Int32Array(ps), 
        colors: new Int32Array(cs),
      });
    }
  }
  _buildFigureFromPatch(index) {
    const figure = this.figures[index];
    assert(figure.type === "patch", "Unexpected patch mesh figure");
    const coords = this.coords,
      colors = this.colors;
    const pi = figure.coords;
    const ci = figure.colors;
    const figureMinX = Math.min(
      coords[pi[0]][0],
      coords[pi[3]][0],
      coords[pi[12]][0],
      coords[pi[15]][0]
    );
    const figureMinY = Math.min(
      coords[pi[0]][1],
      coords[pi[3]][1],
      coords[pi[12]][1],
      coords[pi[15]][1]
    );