Pitot tube failure protection
I believe that Airbus software is probably missing simple protection in airspeed data readouts. At least manuals in previous posts do not describe any such measures.
If ALL Pitot tubes freezes and IAS deviates by 1-50% then computer before admitting that airspeed data is correct should check the acceleration/decelaration rate from inertial sensors. This simple cross check would protect from any type of tubes failure (freezing, blockage etc)