Battery management issues VW New California T7

EV battery stayed at 79-80%. It seems that the EV battery has no role in maintaining the charge of the 12v batteries.
Very unusual. Every hybrid and EV I've driven, the high voltage traction battery would trickle charge the starter battery. Even my Tesla EV has a 12v battery for emergency opening of doors, etc when the EV battery reaches zero and this is also trickle charged from the EV battery if it drops below a certain voltage.
 
I also have a Tesla and indeed they work together. The VW electric architecture seems either/both different and/or suboptimally managed.
 
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