Yikes. FWIW my Taycan with 19.2kW option (which I now believe was a total waste of money) goes over 40A with the PMCC. Only 41-42A but enough that if the wire gauge and breaker were only sized for 40A, it would be a problem and I'd have to turn it down.
Re: the 19.2kW, I'm throwing good money...
I just got my Taycan & tried what you did (the slow as hell ordinary plug). 8A limit. I got about 5% in 18 hours. A 50A circuit with the 6-50 or 14-50 plug will allow for 40A charging (circuits are rated for 80% of the breaker for continuous load).