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)

operatorList,
    executionStartIdx,
    continueCallback,
    stepper
  ) {
    const argsArray = operatorList.argsArray;
    const fnArray = operatorList.fnArray;
    let i = executionStartIdx || 0;
    const argsArrayLen = argsArray.length;
    
    if (argsArrayLen === i) {
      return i;
    }
    const chunkOperations =
      argsArrayLen - i > EXECUTION_STEPS &&
      typeof continueCallback === "function";
    const endTime = chunkOperations ? Date.now() + EXECUTION_TIME : 0;
    let steps = 0;
    const commonObjs = this.commonObjs;
    const objs = this.objs;
    let fnId;
    while (true) {
      if (stepper !== undefined && i === stepper.nextBreakPoint) {
        stepper.breakIt(i, continueCallback);
        return i;
      }
      fnId = fnArray[i];
      if (fnId !== OPS.dependency) {
        this[fnId].apply(this, argsArray[i]);