yes that's why i got confused

try resetting your device. i have same device and i am getting screen on time of around 5.30-6 hrs with mix of youtube,songs,net browsing and few pubg games too.you use your phone on high performance? i keep it mostly on power saving mode

navigation bar toggle option now in notification panel 

turn off the steps counter. what's the big deal

coz its still in beta. it will be better in final build. i am getting around 5 and half hours of screen on time on s9 plus