Attach (recommended) or Link to PDF file here:
[example.pdf](https://github.com/mozilla/pdf.js/files/6916129/example.pdf)

Configuration:
- Web browser and its version: Chrome, Firefox
- Operating system and its version: all
- PDF.js version: various versions, including 2.11.54
- Is a browser extension: no

Screenshot with visible textLayer:
![Screenshot from 2021-08-02 13-05-03](https://user-images.githubusercontent.com/6362989/127844878-f85e291f-2060-4028-be09-7835f32ccfaa.png)

Which means some letters at the beginning/end of text selection are missing when copying text.

if (this.composite && this.toUnicode instanceof IdentityToUnicodeMap) {
        if (/Verdana/i.test(name)) {
          
          applyStandardFontGlyphMap(map, getGlyphMapForStandardFonts());
        }
      }
      this.toFontChar = map;
    }
    amendFallbackToUnicode(properties);
    this.loadedName = fontName.split("-")[0];
    this.fontType = getFontType(type, subtype, properties.isStandardFont);
  }
  checkAndRepair(name, font, properties) {
    const VALID_TABLES = [
      "OS/2",
      "cmap",
      "head",
      "hhea",
      "hmtx",
      "maxp",
      "name",
      "post",
      "loca",
      "glyf",
      "fpgm",
      "prep",
      "cvt ",
      "CFF ",
    ];
    function readTables(file, numTables) {