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The automatic i.e. no pilot intervention (simplistically) worked. The fault ended its authority. If the autopilot still had authority do deal with the problem that it had detected, it would have voted the incorrect source of data out and disconnected that input into the EFCS, then carried on flying normally. It is not designed to do this, that is what pilots are for. You open the loop and let them decide what is the next course of action using the relevant documentation to understand what fault is being displayed and isolate it.
It appears Airbus are making changes to how you would deal with the information presented if this fault reoccurred. Don't blame the pilots OR the aircraft.