A call notification woke me up, then after that notificstion auto closed it was left on the morning report, but the watch never turned off automatically on this screen. Only after closing the morning report and returning to the watch face did the watch display turn off after a delay.
I ve also noticed this behavior in other circumstances. For instance if I open the Controls menu, then do nothing, after a minute or so it will return to the watch face but will never turn the display off automatically.
This is going to cause a huge loss of battery and will make me consider returning the watch since I don't know if Garmin's always behave this way.