Cordova, iOS and Problem with Keyboard an App-Height


i have a problem with cordova and ios on WKWebView, even in the Test-App created from f7-cli,

F7 V5.
Xcode 11.3
Building with Monaca

When opening the keyboard the viewport gets smaller for the keyboard, when closing the keyboard the Viewport-App-Height will not fit again, the app header is not visible anymore.

Ive tried the cordova-keyboard-plugin, but on new xcode it is not working anymore.

Can somebody help me please? thx