Due to some issues I was facing, these were reimported static meshes and Fortnite materials, they were not the base content browser versions, as such they have no relation to FN bugs/versions specifically.
If it is absolutely necessary, I’m sure myself or someone here could make a project that demonstrates Nanite not supporting vertex paint, to my knowledge this was a known limitation of Nanite, but if it’s somehow a bug that’d certainly be interesting.