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

I have upload my test UE4 project on box. When run the app, press F to spawn a particle in the scene, and the particle would fall down and hit on floor. there’s a Collision Event Generator in this particle, Normally, this event would trigger when hit floor.

It’s easy to reproduce this bug, just set bUseFixedFrameRate=True in project settings.

https://app.box.com/s/bde1ntzdtok0gihvxaf0uu79notfmy91

Hello 笑傲江湖-DA,

Thank you for submitting a bug report. I have reproduced this issue and logged a report for it here: Unreal Engine Issues and Bug Tracker (UE-37210)

You can track the report’s status as the issue is reviewed by our development staff.

Cheers,

Ed Burgess