Since 15.31 my T8 brightness is off all the time. I’m normally using the minimum setting and it is stuck to max most of the time. It does sometimes pick up the ambient light and dim but just for a few seconds. Then during AOD, on the watch face and dimmed, the brightness is kind of breathing from max to low and vice versa.
As a result, I'm losing up to one full day of battery more or less.