I know that planes becoming land transports on water shouldn't happen. What I noticed is that all the complaints about this bug have one thing in common: they are trying to land a plane on a ship that is waaay outside the plane's range.
@DoctorDR1 is it possible that the carrier was outside the plane's range? I've been putting planes on carriers by making sure they are in the plane's range and I've never had this problem
I've had a problem with the chat notifications on one of my games since the update. It doesn't show the little red dot indicating a notification initially. It only shows up when I press the button to access the newspaper
This could be due to the expansion penalty. If you expand your empire too far then things go rapidly downhill. Also, have you considered letting Poland into your coalition?