That's what happens with the modular approach airplane families are designed today. Stretch them, make them heavier, install more powerful engines and change the cabin interior and onboard installations (tanks) to upset weight and balance - But keep the wings and rudders the size they were before.
No surprise you end up with some surprises at the corners of the flight envelope. On computer controlled aircraft those things can be modified more elegant than on old style (MAX) mechanical controlled airplanes.