Light Probe Proxy Volume does not initially use all color data on the parent Particle system until its SubEmitter fires.

Repro steps:
1. Open VolumeTest scene from attached project.
2. Press play.
3. Observe how the bottom particle system remains yellow until its SubEmitter fires (image attached).

Expected outcome:
Light Probe Proxy Volume to affect ParticleSystem from the start.

Notes:
- Is regression, worked up to 5.4.0b2, issue appears in 5.4.0b3 onward.
- Looks like the starting yellow color is derived from the far-right side of the light probe group.
- Sometimes expanding the hierarchy of the particle system causes the light probe proxy volume to work from the start (not always reproducible).