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)

imgData,
    scaleX,
    skewX = 0,
    skewY = 0,
    scaleY,
    positions
  ) {
    if (!this.contentVisible) {
      return;
    }
    const ctx = this.ctx;
    ctx.save();
    const currentTransform = ctx.mozCurrentTransform;
    ctx.transform(scaleX, skewX, skewY, scaleY, 0, 0);
    const mask = this._createMaskCanvas(imgData);
    ctx.setTransform(1, 0, 0, 1, 0, 0);
    for (let i = 0, ii = positions.length; i < ii; i += 2) {
      const trans = Util.transform(currentTransform, [
        scaleX,
        skewX,
        skewY,