Attach (recommended) or Link to PDF file here:
https://s3.eu-west-1.amazonaws.com/scai-dev.website.com/tmp/8ab8b56a-fa91-11eb-8d74-0242ac110004.pdf

Hi,
Please see an incorrect canvas rendering for the following document - page 9 specifically. It reproduces on https://mozilla.github.io/pdf.js/web/viewer.html (tried with Chrome). Other pages in this document look pretty much the same but the problem is on page 9 only.

Original screenshot:
![image](https://user-images.githubusercontent.com/23075641/129066656-7bb2fb56-2b88-4f40-8e67-b95bdeb9e521.png)


PDF JS:

![image](https://user-images.githubusercontent.com/23075641/129066734-56503a5c-413c-49c1-9e1c-470da3a642ed.png)

thisChunkHeight = partialChunkHeight;
        elemsInThisChunk = width * thisChunkHeight;
      }
      destPos = 0;
      for (j = elemsInThisChunk; j--; ) {
        dest[destPos++] = src[srcPos++];
        dest[destPos++] = src[srcPos++];
        dest[destPos++] = src[srcPos++];
        dest[destPos++] = 255;
      }
      if (hasTransferMaps) {
        for (let k = 0; k < destPos; k += 4) {
          if (transferMapRed) {
            dest[k + 0] = transferMapRed[dest[k + 0]];
          }
          if (transferMapGreen) {
            dest[k + 1] = transferMapGreen[dest[k + 1]];
          }
          if (transferMapBlue) {
            dest[k + 2] = transferMapBlue[dest[k + 2]];
          }
        }
      }
      ctx.putImageData(chunkImgData, 0, i * FULL_CHUNK_HEIGHT);
    }
  } else {
    throw new Error(`bad image kind: ${imgData.kind}`);
  }
}
function putBinaryImageMask(ctx, imgData) {