EarlyZPassOnlyMateriaMasking Makes Masked Materials on Particles Flicker When Close to the Camera

When "r.EarlyZPassOnlyMaskedMaterials" is enabled, masked materials used with particles will flicker when close to the camera.

Found in 4.17 CL# 3658906, 4.18 CL# 3832480, 4.19 CL 4033788, 4.20 CL# 4369336, 4.21 Preview 1 CL# 4435822, and 4.22 CL# 4457235

1. Open the editor
2. Go to Project Settings>Rendering>Optimizations and enable  "Masked material only in early Z-pass"
3. Restart the editor
4. Create a simple masked material with a base color and opacity mask
5. Create a particle system with the material
6. Place the particle in the level and move closer to it

Results:
The materail will flicker the closer to the camera is to the particle system

Expected:
The material would not flicker