EDIT: Solved in latest dev branch v144229
The Targeting Actions are currently not working / are doing nothing.
- Next Target
- Next target (in vehicle)
- Next empty target (veh.)
These actions are normally used to call out target for your AI, or to lock / cycle between targets that you already spotted, as described in Wiki:Arma_3_Targeting and are currently not working.
The actions Lock Target and Reveal Target have to be used instead, which can be difficult at high speeds / obscured targets.