No, you do nothing wrong. This is a bug with logs in Xcode8 + iOS10.
We can get round it in this way (device and simulator need different values):
Add the Name OS_ACTIVITY_MODE and the Value ${DEBUG_ACTIVITY_MODE} and check it (in Product -> Scheme -> Edit Scheme -> Run -> Arguments -> Environment).
Add User-Defined Setting DEBUG_ACTIVITY_MODE, then add Any iOS Simulator SDK for Debug and set it’s value to disable (in Project -> Build settings -> + -> User-Defined Setting)
