I use Nothing Manacles in PvE all the time, tracking works without problems. But in PvP often it doesn't seem to work for me.
I throw a Scatter next to a player and the projectiles don't seem to track him. When I throw a Scatter next to an enemy in PvE, same distance to the enemy, the projectiles go crazy and fly towards it.
Edit: I'm not talking about bouncing Scatters, that's not an issue I have.
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If they even made the tracking even half as good as skip grenades we might have a half decent exotic there