Attach (recommended) or Link to PDF file here: https://github.com/tesseract-ocr/tesseract/files/947838/2.pdf

Configuration:
- Web browser and its version: N/A
- Operating system and its version: N/A
- PDF.js version: `2.9.223`, or any version after PR #13306 landed.
- Is a browser extension: N/A

Steps to reproduce the problem:
1. Open the document above, e.g. with https://mozilla.github.io/pdf.js/web/viewer.html
2. Search for "of the r"

What is the expected behavior? (add screenshot)
Correct highlighting, please see:

![correct](https://user-images.githubusercontent.com/2692120/117328223-b7158b00-ae93-11eb-805c-73718ff569b5.png)


What went wrong? (add screenshot)
Incorrect highlighting, please see:

![incorrect](https://user-images.githubusercontent.com/2692120/117328447-efb56480-ae93-11eb-8506-da9fc0eb9630.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension): N/A

/cc @brendandahl 

);
    if (!this._onUpdateTextLayerMatches) {
      this._onUpdateTextLayerMatches = evt => {
        if (evt.pageIndex === this.pageIdx || evt.pageIndex === -1) {
          this._updateMatches();
        }
      };
      this.eventBus._on(
        "updatetextlayermatches",
        this._onUpdateTextLayerMatches
      );
    }
  }
  /**
   * Cancel rendering of the text layer.
   */
  cancel() {
    if (this.textLayerRenderTask) {
      this.textLayerRenderTask.cancel();
      this.textLayerRenderTask = null;
    }
    if (this._onUpdateTextLayerMatches) {
      this.eventBus._off(
        "updatetextlayermatches",
        this._onUpdateTextLayerMatches
      );
      this._onUpdateTextLayerMatches = null;
    }
  }
  setTextContentStream(readableStream) {