OnParticleCollide Not Returning Velocity Values Properly

OnParticleCollide doesn't return Velocity on every collision.

User description:

"If you add a particle emitter, and add an Event Generator - Collision and Actor Collision

Binding an event to that Particle Emitter "OnParticleCollide" will report very random values for Emitter Time, somtimes rising values with each collision, and sometimes falling values.

Velocity will report 0,0,0 always, until the max number of collisions has been reached."

1. Open attached project
2. PIE
3. Watch print to screen as particle collides

Results: First four collision events show velocity of 0,0,0 but fifth event returns a real velocity value.
Expected: For velocity to return correctly with each collision.