Still looking at this on our side
I’ve disable quite a lot of things including disabling niagara with fx.Niagara.SetOverrideQualityLevel 0 and show niagara as well. Still have the Warning.
Disabled HLOD, Translucency, skeletalmeshes and still nothing. But … doing Show NanitesMeshes and the warning stop … a bit counterintuitive when the warning says non nanite mesh causing the trouble hehe.