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.textContent || this.textContentStream) || this.renderingDone) {
      return;
    }
    this.cancel();
    this.textDivs = [];
    const textLayerFrag = document.createDocumentFragment();
    this.textLayerRenderTask = renderTextLayer({
      textContent: this.textContent,
      textContentStream: this.textContentStream,
      container: textLayerFrag,
      viewport: this.viewport,
      textDivs: this.textDivs,
      textContentItemsStr: this.textContentItemsStr,
      timeout,
      enhanceTextSelection: this.enhanceTextSelection,
    });
    this.textLayerRenderTask.promise.then(
      () => {
        this.textLayerDiv.appendChild(textLayerFrag);
        this._finishRendering();
        this._updateMatches();
      },
      function (reason) {
        
      }