Attach (recommended) or Link to PDF file here:
[backgroundimage_not_visible_anonymisiert.pdf](https://github.com/mozilla/pdf.js/files/6544725/backgroundimage_not_visible_anonymisiert.pdf)


Configuration:
- Web browser and its version: Chrome Version 90.0.4430.212 (Offizieller Build) (x86_64)
- Operating system and its version: Windows 10, MacOs BigSur
- PDF.js version: 2.5.207
- Is a browser extension: no

Steps to reproduce the problem:
1. open the document in demo viewer.js
2.

What is the expected behavior? (add screenshot)
The backgroundimage gets rendered like in Acrobat Reader
<img width="1348" alt="Bildschirmfoto 2021-05-26 um 09 44 21" src="https://user-images.githubusercontent.com/1286150/119621970-00a82480-be07-11eb-8fed-f74ac04b840b.png">

What went wrong? (add screenshot)
Backgroundimage is not rendered only some  text
<img width="987" alt="Bildschirmfoto 2021-05-26 um 09 43 57" src="https://user-images.githubusercontent.com/1286150/119621938-fab24380-be06-11eb-92ac-4ecb2c9334b1.png">




Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

} else {
      
      scale = Util.singularValueDecompose2dScale(owner.baseTransform);
      if (this._matrix) {
        const matrixScale = Util.singularValueDecompose2dScale(this._matrix);
        scale = [scale[0] * matrixScale[0], scale[1] * matrixScale[1]];
      }
    }
    
    
    const temporaryPatternCanvas = this._createMeshCanvas(
      scale,
      shadingFill ? null : this._background,
      owner.cachedCanvases
    );
    if (!shadingFill) {
      ctx.setTransform.apply(ctx, owner.baseTransform);
      if (this._matrix) {
        ctx.transform.apply(ctx, this._matrix);
      }
    }
    ctx.translate(
      temporaryPatternCanvas.offsetX,
      temporaryPatternCanvas.offsetY
    );
    ctx.scale(temporaryPatternCanvas.scaleX, temporaryPatternCanvas.scaleY);
    return ctx.createPattern(temporaryPatternCanvas.canvas, "no-repeat");
  }
}
class DummyShadingPattern extends BaseShadingPattern {