Attach (recommended) or Link to PDF file here:
[output.pdf](https://github.com/mozilla/pdf.js/files/6374987/output.pdf)

Configuration:
- Web browser and its version: Firefox 88.0
- Operating system and its version: macOS Big Sur 11.2.3 (20D91)
- PDF.js version: 2.8.243
- Is a browser extension: no/Firefox built-in

Steps to reproduce the problem:
1.  add Ink-Annotations to a pdf (i use https://github.com/highkite/pdfAnnotate, Annotations with appearance streams are shown correctly)
2. open output file in firefox

What is the expected behavior? 
The annotations should be visible.
![Bildschirmfoto 2021-04-26 um 09 15 48](https://user-images.githubusercontent.com/33630884/116043809-6a020f80-a670-11eb-973c-6f2df3dae532.png)

What went wrong? 
The annotations are added to the dom but invisible.
![Bildschirmfoto 2021-04-26 um 09 18 26](https://user-images.githubusercontent.com/33630884/116043867-7e460c80-a670-11eb-964d-0cc2c6dbfb61.png)

Tested successfull with FoxitReader, AcrobatReader, Chrome and Safari.
(x < rect[0] || x > rect[2] || y < rect[1] || y > rect[3])
      ) {
        return null;
      }
      quadPointsLists[i].push({ x, y });
    }
  }
  
  
  
  
  
  
  
  
  
  
  
  
  return quadPointsLists.map(quadPointsList => {
    const [minX, maxX, minY, maxY] = quadPointsList.reduce(
      ([mX, MX, mY, MY], quadPoint) => [
        Math.min(mX, quadPoint.x),
        Math.max(MX, quadPoint.x),
        Math.min(mY, quadPoint.y),
        Math.max(MY, quadPoint.y),
      ],
      [Number.MAX_VALUE, Number.MIN_VALUE, Number.MAX_VALUE, Number.MIN_VALUE]
    );
    return [