keepAlive doesn't work for iOS devices

[stanhughes]

In iOS when the application is suspended and returns to foreground there is a chunk error. This doesn't happen in Android and doesn't happen in the iOS simulator. However, it does occur with actual iOS devices.

Steps to repeat:

1. Using a physical iOS device.
2. Open a large complex React app in the react-native-static-server using react-native-webview.
3. Suspend the app.
4. Wait about 5 to 10 minutes.
5. Return to the app.

Expected behavior:
App should display at the same page at the time it was suspended. This is what happens with the Android device and in the iOS simulator.

Actual behavior:
An error occurs that the chunk cannot be loaded.

System:
OS: macOS 10.15.6
CPU: (4) x64 Intel(R) Core(TM) i5-4690 CPU @ 3.50GHz
Memory: 91.50 MB / 32.00 GB
Shell: 5.7.1 - /bin/zsh
Binaries:
Node: 14.12.0 - /usr/local/bin/node
Yarn: 1.22.5 - /usr/local/bin/yarn
npm: 6.13.4 - /usr/local/bin/npm
Watchman: 4.9.0 - /usr/local/bin/watchman
Managers:
CocoaPods: 1.8.4 - /usr/local/bin/pod
SDKs:
iOS SDK:
Platforms: iOS 13.7, DriverKit 19.0, macOS 10.15, tvOS 13.4, watchOS 6.2
Android SDK:
API Levels: 23, 28, 29, 30
Build Tools: 28.0.3, 29.0.2, 30.0.1
System Images: android-29 | Intel x86 Atom_64, android-29 | Google APIs Intel x86 Atom, android-29 | Google APIs Intel x86 Atom_64, android-29 | Google Play Intel x86 Atom, android-30 | Google APIs Intel x86 Atom_64, android-30 | Google Play Intel x86 Atom_64
Android NDK: Not Found
IDEs:
Android Studio: 4.0 AI-193.6911.18.40.6626763
Xcode: 11.7/11E801a - /usr/bin/xcodebuild
Languages:
Java: 1.8.0_242 - /usr/bin/javac
Python: 2.7.16 - /usr/bin/python
npmPackages:
@react-native-community/cli: Not Found
react: 16.13.1 => 16.13.1
react-native: 0.63.2 => 0.63.2
npmGlobalPackages:
react-native: Not Found