Sorting Issue With Many Overlapping GPU Paricles

GPU particles have a strange sorting priority once a significant amount of overlap starts happening. Changing the sort mode doesn't influence this effect at all. While on CPU particles changing the sort mode does change the visual appearance.

1. Open attached project (124865-the415test.zip)
2. Open a Copy when prompted
3. Open the Particle asset

RESULT
The GPU particles begin changing colors as it attempts to sort the overlapping particles.

EXPECTED
The CPU and the GPU particles sort with the same visual result.