Only the last simple collision added to a static mesh is counted for sweep

When using multiple simple collisions on a static mesh it appears that sweep only uses the last collision added when calculating when/if to stop.

1. Download the attached project
2. Open the project
3. Open the map named "Untitled"
4. Play in editor

Result: The Cube will stop roughly halfway through the floor
Expected: The Cube would take into account all collision when detecting for a sweep