When keyboard closes, viewport is 20px taller (iOS 11)

[filippopossenti]

I'm experiencing an issue whereas if I set:
cordova.plugins.Keyboard.disableScroll(true);

And then I open the keyboard, when the keyboard closes the viewport is 20px taller and it starts from -20px vertically.
This affects the experience as my app after the keyboard is used is no longer displaying at the correct position.