Trigger volumes do not detect overlap events

Trigger volumes do not detect overlap events. Tested in //depot/UE4/Promotable-CL-2394966

1. Create a new Third Person Blueprint template project
2. Place a Trigger Volume in the level
3. In the Level Blueprint, add an OnActorBeginOverlap event
4. Attach a Print String
5. PIE
6. Run the character into the Trigger Volume

Results:
The Overlap event is never triggered