@jimboRen If you're using the macOS Catalina beta, you'll need to ensure you're using Alfred 4.0.2 (Check for updates in the Update tab). Once you've updated, go to Features > Default Results and click "Reset" at the bottom of the Search Scope window to refresh the search scope and include the new paths from Catalina.
You may also want to type "reload" into Alfred to refresh the application cache.