This might not be the answer you seek, but often after a firmware or software update Android phones erase some of the battery optimization routines they've built during normal use. So right after an update it's back to no optimization. SO it looks as if the battery drains faster than usual
I've had that with other phones. Keep up the normal use and it should eventually learn and optimize battery usage again. I you still see excessive battery drain, then we can consider it a bug.
