Looks like I'm still experiencing range loss while the car is sleeping -- and at a higher rate than I did with 4.5 (which would lose ~7-8 miles per day, and averaged 7.2 miles lost per day the one time it was parked for a week at the airport).
On 5.6, I noticed it was losing ~3 miles while parked at work -- similar to 4.5. But I didn't take any specific notes on it until yesterday/this morning. We returned from an overnight road trip around 1:30pm yesterday and the car had 40 miles remaining rated range shown. I had it charge to 75% overnight, and I checked it just before 7am -- the dash showed 141 rated miles, and the charging screen showed it had added 107 miles of range... so 40+107-141=6 miles lost in approx 17.5 hours. If that loss holds, I'm now losing ~10 miles of range per day on 5.6. With the holiday today, I don't think I'll drive it, so will monitor it at ~1:30pm today and again tomorrow morning.
The car appears to be going to sleep since I see the dash doing its ~11 second wake up, and Visual Tesla gives me the sleep warning if I open that app while the car is sleeping. I did try rebooting both screens when we returned from the trip yesterday.