@RLNTE not working on mob summoned by skill

I am trying to create an item which will summon a storm of stars to rain down on where it lands. So the item fires a projectile which then summons an invisible mob, which then uses a skill on spawn which is supposed to rain stars all around it using @RLNTE. The problem it, instead the stars fall directly on top on the mobs head with no spread at all, as if @RLNTE was not even being used

However, when I summon the invisible mob using the /mm mobs spawn command, it works fine

Any ideas on...

@RLNTE not working on mob summoned by skill