Screen doesn't rotate many times on iOS from landscape to portrait

On `iOS` (mostly on iPhone7 & iPhoneX), when we switch from `landscape` to `portrait`, the orientation doesn't change. There are two behaviour that we noticed:

1. The orientation doesn't change at all
2. Only the orientation of the webview doesn't change but keyboard opens fine in expected orientation

**Example of behaviour2 (buggy) when navigating to this page from a landscape page:**

**While this should be the page:**

The same happens with the behaviour 1.

We tried to identify the pattern but nothing helped. We also tried to add a delay in between changing the orientation and navigation between the page but the behaviour is same.

```
Ionic:

ionic (Ionic CLI) : 4.8.0 (/usr/local/lib/node_modules/ionic)
Ionic Framework : ionic-angular 3.9.2
@ionic/app-scripts : 3.2.0

Cordova:

cordova (Cordova CLI) : 7.1.0
Cordova Platforms : android 7.1.2, ios 4.5.5
Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 1.2.1, (and 21 other plugins)

System:

Android SDK Tools : 26.1.1 (/Users/shashank/Library/Android/sdk)
ios-deploy : 1.9.2
ios-sim : 5.0.11
NodeJS : v8.12.0 (/usr/local/bin/node)
npm : 6.4.1
OS : macOS Mojave
Xcode : Now using system ruby. Xcode 10.1 Build version 10B61
```

Start by reproducing the landscape-to-portrait transition on the reported iPhone 7 and iPhone X cases using the Ionic, Cordova, iOS, and plugin versions listed in the issue. Compare both reported failures: no rotation and a rotated keyboard with an unchanged webview. Done means navigation consistently produces the expected portrait orientation.

Written by the indexing model from the issue text.