Classic Editor - Code Editor Not Running Reliably

[jericsinger]

1. My goal: Run code in the editor and read what’s returned
2. Issue: The editor doesn’t seem to be fully loading. In transformers, {{ bracketed }} code isn’t shown as green and doesn’t appear to be reading. In JS queries, clicking “Test” doesn’t return results, even in skeleton apps.
3. Steps I've taken to troubleshoot: Created a new query with nothing more than “return ‘hello’;” as the only code. Clicked “Test.” Editor claims nothing is returned.
4. Additional info: Cloud. Screenshots below.