What model car do you have? Is it new or an older car? Older Model S and X can have a weird bug where the car won't go to sleep after charging that seems to be triggered by a software update. I haven't seen anyone with AP2 cars say they've seen it.
But most of the time this is due to some feature turned on that is not allowing the car to sleep.
Model 3 2019. I start noticing it lately. But is it normal that car loses 3-4% for 1 hour?