Attach (recommended) or Link to PDF file here:
[test.pdf](https://github.com/mozilla/pdf.js/files/6715502/test.pdf)

Configuration:
- Web browser and its version: Google Chrome Version 91.0.4472.114 
- Operating system and its version: Windows 10 Enterprise
- PDF.js version: 
- Is a browser extension: yes

Steps to reproduce the problem:
1. download file
2. open file



What is the expected behavior? (add screenshot)
show symbol
![image](https://user-images.githubusercontent.com/50500976/123409847-55ca8800-d5b7-11eb-9e5b-c7f3b33c00e1.png)

What went wrong? (add screenshot)
Does not show symbol
![image](https://user-images.githubusercontent.com/50500976/123409707-274cad00-d5b7-11eb-9a64-b11dcf3cdc3f.png)
Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension): Latest Version Chrome extension

tables.cmap,
        font,
        this.isSymbolicFont,
        properties.hasEncoding
      );
      const cmapPlatformId = cmapTable.platformId;
      const cmapEncodingId = cmapTable.encodingId;
      const cmapMappings = cmapTable.mappings;
      const cmapMappingsLength = cmapMappings.length;
      let baseEncoding = [];
      if (
        properties.hasEncoding &&
        (properties.baseEncodingName === "MacRomanEncoding" ||
          properties.baseEncodingName === "WinAnsiEncoding")
      ) {
        baseEncoding = getEncoding(properties.baseEncodingName);
      }
      
      
      
      if (
        properties.hasEncoding &&
        !this.isSymbolicFont &&
        ((cmapPlatformId === 3 && cmapEncodingId === 1) ||
          (cmapPlatformId === 1 && cmapEncodingId === 0))
      ) {
        const glyphsUnicodeMap = getGlyphsUnicode();
        for (let charCode = 0; charCode < 256; charCode++) {
          let glyphName;
          if (this.differences[charCode] !== undefined) {