When you search using the Apps Manager search, it shows a blank screen. If data loading was too slow, Apps Manager errors out to a blank screen when users clicked into the search bar.
If you debug further, you will see this error on the browser's console:
application.js?v=1590840481:61 Uncaught (in promise) Invariant Violation: Minified React error #152; visit https://reactjs.org/docs/error-decoder.html?invariant=152&args[]=t for the full message or use the non-minified dev environment for full errors and additional helpful warnings.