Particle Random Value is the same for all particles with a Niagara Mesh Renderer

A material using the Particle Random Value node returns the same value for every particle
drawn by a Niagara Mesh Renderer. Particle transforms are not affected, only the random value.

This happens when Nanite is disabled for the project and a SceneCapture2D using
"Use ShowOnly List" is present in the level.

It does not reproduce in 5.7. Setting r.GPUScene.UseReservedResources=0, which is the 5.7
default, avoids the issue.

1. Create a blank project, then create and open a new empty level.
2. Disable Nanite and Ray Tracing.
   Add the following to Config/DefaultEngine.ini and restart the editor:

   [/Script/Engine.RendererSettings]
   r.Nanite.ProjectEnabled=False
   r.RayTracing=False

3. Create a Material and set it up as follows:
   • Blend Mode: Translucent
     (shown as "TranslucentGreyTransmittance" when Substrate is enabled)
   • Usage: enable "Used with Niagara Mesh Particles"
   • Connect a Particle Random Value node to Emissive Color
4. Create a Niagara System from the Fountain template, then:
   • Delete the Sprite Renderer and add a Mesh Renderer
   • Mesh: /Engine/BasicShapes/Cube
   • Override Material: the material from step 3
5. Place the Niagara System in the level.
6. Place a SceneCapture2D in the level.
   • Texture Target: create a Texture Render Target 2D and assign it here.
   • Primitive Render Mode: Use ShowOnly List
   • Show Only Actors: leave empty
   • Capture Every Frame: enabled
7. Play in Editor and look at the particles.

Expected Result
Each particle is rendered with a different random value.

Actual Result
All particles are rendered with the same value.