It's interesting that there is more vampire drain when connected to power, than there is when parking without a power connection.
We parked our 2018 X 100D (with MCU2) at an airport for 12 days and lost about 1 mile of charge per day.
But when we have it in the garage, we'll lose more charge.
This could be part of Tesla's strategy to protect the battery packs. When you're connected to power, the car drains a little charge - so the batteries aren't sitting at a constant charge level, and then periodically charges the car back to the desired level. When you're parked disconnected from power, the car is slowly draining the battery pack, so the charge level is slowly changing.
Wouldn't worry about it, as long as you are getting back to about the same level when you recharge.