Particle light flickering with certain Post Process Settings

Particle lights cause flickering when using either FXAA or no AA, but turns into black squares on the screen when you enable Gaussian Blur

Regression: Yes, does not occur in 4.10

1. Open the attached project
2. In the sample map, select the Global PostProcess Volume
3. Change the AA method to FXAA

Result: White flickering lights

4. Change the DoF to Gaussian Blur

Result: Black flickering boxes

Particle light causing black square flickering in 4.11 (Worse with DOF)