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

++ifLevel;
        } else if (op === 0x1b) {
          
          inELSE = ifLevel;
        } else if (op === 0x59) {
          
          if (inELSE === ifLevel) {
            inELSE = 0;
          }
          --ifLevel;
        } else if (op === 0x1c) {
          
          if (!inFDEF && !inELSE) {
            const offset = stack[stack.length - 1];
            
            if (offset > 0) {
              i += offset - 1;
            }
          }
        }
        
        if (!inFDEF && !inELSE) {
          let stackDelta = 0;
          if (op <= 0x8e) {
            stackDelta = TTOpsStackDeltas[op];
          } else if (op >= 0xc0 && op <= 0xdf) {
            stackDelta = -1;
          } else if (op >= 0xe0) {
            stackDelta = -2;
          }