Material base color is lighter on Nanite meshes when using 16-bit GBuffer

The base color is brighter on Nanite meshes than non-Nanite meshes when GBuffer Format is set to "Force 16-bits per channel" (r.GBufferFormat 5) even though the meshes are using the same material.

1. Add a Nanite mesh and a non-Nanite mesh to a level
2. Create a default Material, set the Base Color to a dark grey and assign it to both meshes
3. Change the GBuffer mode to 16-bit using the console command r.gbufferformat 5 or open Project Settings and set the GBuffer Format to "Force 16-bits per channel" and restart the Editor.

Expected

The material on the meshes looks the same when the GBuffer format uses 16-bits per channel.

Actual

The material looks brighter on the Nanite mesh , but not the regular mesh.  If you enable the GBuffer visualization you can see the basecolor for the Nanite mesh is much brighter.