installed html5 app freezes in ios13 after navigating to an external url in in-app standalone safari browser and back

Issue

My web application built using nuxt and installed as web app on iphone becomes unresponsive after I open or visit an external link from the app. Issue specifically comes iOS 13.4 and above on real devices. Simulators works fine.

Devices

iPhone X and XI (all versions) with iOS 13.4 and above

Steps to reproduce

1. Open nuxt-min-pwa.netlify.app safari.

2. Tap on share icon and then add to home screen.

3. Open app from home screen.

4. Tap on menu icon.

5. Tap on second.

6. Tap on link named ICE.

7. App will open an external url.

8. Tap on Back to App button to return to the app.

9. Tap on second now.

10. App does not responds. A thin loading bar seems to be in progress, everytime second is tapped. But nothing else happens.

Web app is working fine in iphone8 (tested with ios13.3.1 and ios 13.6.1) and Xcode simulators.