Well, that'll learn me to read properly.
Anyway, ConvertToHijackedVehicleCrateCollide does work. Maybe in your case the weapon object detonates and is subsequently destroyed before the hijack module can do anything? Or, if the projecile lands next to its target but doesn't hit it directly, it's not going to cause a crate collide. If the weapon is instant-hit (zero radius) but has a weapon object (most instant-hit weapons don't have a projectile, just FX), it should work every time without fail.
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