Same here! It just sits there. And I am unable to get into my Apps to make updates without this. In the browser console, there is a 404 error on the page. (This happens in Google Chrome and Safari on macOS)
[Error] Failed to load resource: the server responded with a status of 404 () (tidbits-popover.angular.min.js.map, line 0)
https://appstoreconnect.apple.com/agreements/scripts/npm/tidbits-popover.angular.min.js.map
[Error] Failed to load resource: the server responded with a status of 500 () (locales, line 0)