Wonder if anyone else has seen this. Went on holiday and left the car at a nearby station. As often recommended, and what I used to do with my 1st gen EV6, I left it in valet mode. Engaged it through the touchscreen.
Checked on Homeassistant a few days later, and noticed it had consumed about 20% battery just standing still.
The gap is because when I saw the issue I disabled valet mode, and stopped Homeassistant checking the battery level. The battery continued to drop and by the time I returned to the car, it was down to 25%.