Why is caching not working (create react app)?

Question

React

Hello. I set up pwa for the site i.e. added manifest.json and allowed service-worker registration in index.js file
(serviceWorker.register();) and it all happens in create react app. The PWA works and I can add the application to the desktop, but there is a problem, caching works strangely.
When the page loads, I see that the cache store contains everything I need

. But I still need offline mode, so I try to disconnect the Internet and reload the page, but I get the following.

The cache is gone and I get an error, instead of a cached page.
In general, what could be the problem? Thank you.