Rendering glitch during keyboard is displayed on Cordova android app

Question

During the animation to bring up the keyboard (tap on an input field) some random fragments from previous screens appear in the webview for 10-20 ms. The screen after the animation is fine.

I can observe this when the web view must scroll ('adjustResizing' is on) and or not. Sometimes it also happens during the slide-transition of navigation .

For me, it's android only, on iOS have no glitch.

Cordova v10.0
cordova-android v10.0
related Config.xml preferences are checked and tested
android:windowSoftInputMode="adjustResize"

• How and where can I locate the issue?
• How can i fix it?
• I am very grateful for every hint!

screenshot: green fragment top right of the keyboard