Not sure what you mean by "normal autoland".
Bear with me, I'm just the electrical guy.
Engaging autoland causes the FCCs to send an isolation request signal to the bus power control units. If the BCUs can reconfigure the electrical system to provide three isolated channels, they will do so and provide a confirmation signal once configured. If one or more sources are lost, the power system will reconfigure to provide power to all buses. If this results in a loss of three channel isolation, the confirmation signal will be removed.
The response of the FCC/autoland system and resulting cockpit warnings are a bit beyond my expertise. But I believe that the behavior and warning messages depend on the altitude at which the 'out of configuration' condition occurs. Above the decision altitude, the failure is handled the same way a failure to enter isolated mode would be (a BCU FAIL message if I recall correctly). Below, the failure is annunciated but is a fail active condition, where the autoland system remains engaged.