Well it doesn't short by itself? This is explainable, not voodoo.Nope, it was plugged in for 2 weeks, came home and it’s dead. Not the 12v …. Salesman said it was their fault keeping it plugged in.
My guess is, since charging cable is stuck and a dead car, 12 V went empty. That could happen if something, e.g. a cabin light or maybe the cooling associated with AC charging kept active for 2 weeks. Or maybe the system that checks sosc while charging.
The question then is why doesn't the 800V battery with 90ish kWh charge the 12V battery, anf AC charger replenish the 800V. That is a software bug that needs to be fixed. Or it could be a broken 12V battery only.
Tesla has this in check, unless you run below 5 or 10% SOC the 12V charging is stopped, could leve you stranden well before 0%.
Some other brands have different 12V charging algorithms, but they are not published.
I don't know how Porsche's algorithm is, just speculating it might only charge 12V while driving, then this could happen.