Agreed that the steering wheel scroll buttons are good but for aircon I'd rather have a proper automation than physical buttons.
I had a BMW iX before Taycan and the only times I adjusted the aircon was one degree up for the summer and one degree down for winter (t-shirt vs long sleeve)...
Was it wet when that happened? I got exactly similar incidence a couple of months back. Pouring rain, tried multiple DC chargers and immediately after the handshake the charging stopped in error. AC working fine.
Shop didn't find anything and has not happened ever since.