Attach (recommended) or Link to PDF file here:
[PATTYP2.pdf](https://github.com/mozilla/pdf.js/files/6471935/PATTYP2.pdf)

Configuration:
- Web browser and its version: FF 88.0.1
- Operating system and its version: W10.0.19042.985
- PDF.js version: https://mozilla.github.io/pdf.js/web/viewer.html

Steps to reproduce the problem:
1. open file to display

What is the expected behavior? (add screenshot)
![grafik](https://user-images.githubusercontent.com/6665575/118114800-5e407800-b3e8-11eb-860f-019f48a8eabf.png)

What went wrong? (add screenshot)
![grafik](https://user-images.githubusercontent.com/6665575/118114841-6c8e9400-b3e8-11eb-8252-1517e5d76475.png)

(memo for me: when fixed, check the files in https://issues.apache.org/jira/browse/PDFBOX-1958 )

constructor(IR) {
    super();
    this._type = IR[1];
    this._bbox = IR[2];
    this._colorStops = IR[3];
    this._p0 = IR[4];
    this._p1 = IR[5];
    this._r0 = IR[6];
    this._r1 = IR[7];
    this._matrix = IR[8];
  }
  getPattern(ctx, owner, shadingFill) {
    const tmpCanvas = owner.cachedCanvases.getCanvas(
      "pattern",
      ctx.canvas.width,
      ctx.canvas.height,
      true
    );
    const tmpCtx = tmpCanvas.context;
    tmpCtx.clearRect(0, 0, tmpCtx.canvas.width, tmpCtx.canvas.height);
    tmpCtx.beginPath();
    tmpCtx.rect(0, 0, tmpCtx.canvas.width, tmpCtx.canvas.height);
    if (!shadingFill) {
      tmpCtx.setTransform.apply(tmpCtx, owner.baseTransform);
      if (this._matrix) {
        tmpCtx.transform.apply(tmpCtx, this._matrix);
      }
    } else {
      tmpCtx.setTransform.apply(tmpCtx, ctx.mozCurrentTransform);
    }