Particle Collision(Scene Depth) does not work when inside a Planar Reflection Bounding Box

Whenever a particle system utilizing GPU sprites with collision is enveloped within a planar reflection bounding box, the collision stops working.

1. Open attached project
2. Drag a planar reflection actor into the level and make sure the particle system is enclosed within the bounding box

RESULT
Particle sprites fall through floor

EXPECTED
Particle sprites continue to collide with floor asset

Scene depth particle collision works in all levels but one