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

if (ttContext.tooComplexToFollowFunctions) {
        return;
      }
      if (ttContext.functionsDefined.length > maxFunctionDefs) {
        warn("TT: more functions defined than expected");
        ttContext.hintsValid = false;
        return;
      }
      for (let j = 0, jj = ttContext.functionsUsed.length; j < jj; j++) {
        if (j > maxFunctionDefs) {
          warn("TT: invalid function id: " + j);
          ttContext.hintsValid = false;
          return;
        }
        if (ttContext.functionsUsed[j] && !ttContext.functionsDefined[j]) {
          warn("TT: undefined function: " + j);
          ttContext.hintsValid = false;
          return;
        }
      }
    }
    function foldTTTable(table, content) {