It sounds like you need to upgrade your project to DX12, which is now required for Nanite, otherwise DX11 just displays a proxy mesh. See this post for details: Huge quality loss with Nanite?
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It sounds like you need to upgrade your project to DX12, which is now required for Nanite, otherwise DX11 just displays a proxy mesh. See this post for details: Huge quality loss with Nanite?