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):

ctx.fillStyle = pattern.getPattern(ctx, this, true);
      const inv = ctx.mozCurrentTransformInverse;
      if (inv) {
        const canvas = ctx.canvas;
        const width = canvas.width;
        const height = canvas.height;
        const bl = Util.applyTransform([0, 0], inv);
        const br = Util.applyTransform([0, height], inv);
        const ul = Util.applyTransform([width, 0], inv);
        const ur = Util.applyTransform([width, height], inv);
        const x0 = Math.min(bl[0], br[0], ul[0], ur[0]);
        const y0 = Math.min(bl[1], br[1], ul[1], ur[1]);
        const x1 = Math.max(bl[0], br[0], ul[0], ur[0]);
        const y1 = Math.max(bl[1], br[1], ul[1], ur[1]);
        this.ctx.fillRect(x0, y0, x1 - x0, y1 - y0);
      } else {
        
        
        
        
        
        this.ctx.fillRect(-1e10, -1e10, 2e10, 2e10);
      }
      this.restore();
    }
    
    beginInlineImage() {
      unreachable("Should not call beginInlineImage");
    }
    beginImageData() {