A32NX cruise speed limit

Sure. By the way, there is a Mach/Airspeed toggle switch next to the Mach/Airspeed selector. In the real airplane, the flightcrew can switch between Mach and airspeed at any time. But the switch is not simulated correctly yet. Currently, the airplane will switch to using Mach automatically, but can only be switched back to airspeed below around 26,000 feet.