I have the same issue! But if you use WKWebView it would solve the extra padding issue. https://ionicframework.com/docs/wkwebview/
In my case it helped but then again I have some issues with CORS so I’m still looking for a fix without WKWebView. give it a try!
@mondelize is correct, I also had the same issue (even with updating to the snapshot of 3.7.1), and the padding issue remained until I added the viewport-fit=cover and updated cordova-plugin-ionic-weview.