Particle Parameter Won't Update If Used With EventReceiver Spawn

Particle Float Parameter for the EventReceiver Spawn doesn't update when accessed via blueprint it just retains whatever default value is assigned in cascade. I've confirmed other modules work as expected.

1. Open attached project
2. PIE and press the "T" key

RESULT
A Particle Emitter is spawned in the middle of the map and "0" is printed on screen.
Two particles should be visible.

EXPECTED
A Particle Emitter is spawned in the middle of the map and "10" is printed on screen.
Twelve particles should be visible.