That's exactly what I thought...
If I was a betting man, I'd say the water managed to get inside of the door card and must have triggered the electrics in thinking it should be open and that must be the reason why it wouldn't close right away.
It shouldn't have happened though and eventually, our cars will need to be able to deal with large puddles! I shouldn't and can't see myself doing a 3 point turn after seeing a largish puddle in front of me.
Surely the OP didn't mean 2' deep because he mentioned other cars going through without problem. That depth would probably have caused at least one of the others to become stranded & most to turn around (if I saw vehicles with water above the wheel arches I would never proceed regardless of the vehicle I was driving).
Either way, if it really was 2' deep & Tesla now know that I doubt they will repair without payment.
Fingers crossed for you. Lapping over the sills sounds a bit better, but it's still high given that the interior of the car is lower than that, and the battery, etc (as said above) is even lower.On reflection, 2ft was a little overestimated, never been great with measurements! I would say water was deep enough to lap over the door sills, I think you are correct in that it got inside the door card and messed with the electrics. Ive explained to Tesla exactly what happened and they assure me it will be covered under warranty but will find out for sure when it goes in next week.
My car has opened a window once, with the car locked. Got in the car to find the passenger side front window was partially open, and, as luck would have it, it had rained heavily overnight, so the car was pretty wet inside. The odd thing is that we were away at the time, so I had my phone on most of the time, and yet didn't get any alert on the app.
I seem to remember that one or two others have also had phantom window opening events, too, so although rare, I think it is something that can happen. As it happened to my car in heavy rain, albeit when parked, I wonder if there's something related to water getting in to a connection somewhere.