B2 - Music doesn't appear in by-app battery usage

[MrGimper]

Using B2 on 5s

Been listening to music for about an hour. Went into the battery usage by application screen and music doesn't appear in the list of apps having used battery.

Seems bizarre as I would certainly expect it to. Can someone else confirm before I raise a bug.

Thanks

 

[MrGimper]

After several hours (not listening to music), music has now appeared in the list.