Setting Fixed Frame Rate Prevents Particle Collision In PIE, Standalone, and Packaged Game

If you set the project to use a fixed frame rate, particle collision no longer works.

1. Open attached project
2. Open test map
3. Play In Editor

RESULT
The particles will start to fall through the floor

EXPECTED
The Particles continue to collide

REGRESSION?
Yes

Collision Event of Particle can't trigger when set bUseFixedFrameRate=True