PWA app (Responsive web offline) is not working when internet not connected

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I have created a Progressive Web App and add profile for Responsive Web Offline   After publishing the app when I open the app it opens the Home page configured in the Responsive Web profile.   When I disconnect the internet connection and open the app again, I expect the home page configured in Responsive Web offline to open. But instead I am getting the message You are offline! Check you connection and try again.   Can anyone help me in resolving this issue?
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