Reloading a page won't update/remove the previous version of its service worker. To make sure you're using the latest version of your service worker, make sure to check the "Update on reload" toggle in the "Application" ⭢ "Service Workers" section of the Chrome DevTools.
To simulate a network condition (e.g.: offline, 3g, etc...) in a service worker on Chrome, uncheck the "Update on reload" toggle.