Necromancer melee minions still fail to engage enemy targets reliably: they frequently simply stand without entering combat. This seems to be independent of distance to target either at engagement time or during subsequent combat; it may be related to the “age” of the minion, or some sort of other time factor where they become “stale” somehow. (Since there’s no easy way to dismiss most minions, this is tricky to test; that’s a separate — and presumably intentional — gameplay mechanic issue, however.)