Just adding an updated copy of the BM2 data for yesterday, and one showing the overnight charging...
Yesterday completed with no spurious 12V charge cycles, just the one at 07:00. turned on Smart Charging when I got home after a short drive in the car, that did not trigger a 12V charge either.
Smart charging began polling the car soon after turning it on and you can see the dip in the 12V leading up to 01:00 where the first 30 min charge began at 01:00.
The 2nd charge ran from 02:30 to 04:00, then a final short charge from 04:30 which brought the car up to the set target of 70%.
Smart Charging turned off via HA at 05:30, no 12V charging cycles triggered at all today so far...
Took the car to Sainsbury's where is was plugged in to their free 11kW charger from 08:45 for just under an hour which took it up to 80%, then drove home and plugged into Zappi in Eco+ mode to soak up the spare solar energy this morning...
All good, and I would have no problems staying on IO even with the 12V issues as it really is not an issue for me with just some very mild automation as a safety net.
Not likely to be charging again tonight though.