This has happened to me a couple of times, but my 2018 has the auto parking brake fix, so it hasn't caused a problem, EXCEPT......
my aux battery died a couple of days ago, and I can't find out why. It hasn't reached end-of -life, and was fine two days before, so I'm wondering how it came to run down, The only thing I can think of is that, when you press the button to switch off, if you are not in P, it does not switch off, but adopts the acc setting. I definitely had the lever to P, but if it did not engage properly, could it have left the electrical system in acc, which would account for the run down? I'm suspicious, and will make a point of checking in future that the button lamp indicator is out.