I think there may have been some confusion at the factory when these changes were introduced and some cars left with this 'feature'. The issue as Dab describes is likely to go unnoticed for some time. It's not until you have the engine and hazards on and remove the key that you realise there is an issue. i think it is unrelated to any fuses blowing. There are probably more cars out there the same and the owners are blissfully unaware.
There was a thread on this issue last year.
