In 5.0 nanite is not supported in VR (doesnt support stereo). Meshes will use the Nanite fallback mesh that gets auto generated. You need to pay careful attention to the Nanite Fallback values on the meshes. You may notice that in VR and baked lighting meshes look kind of raggedy and rough like bad auto LOD. You can force the full res geo with those Nanite fallback settings if you need. I am hopeful that in 5.1 Nanite in VR will give the performance benefits of Nanite even in baked lighting… but I haven’t been able to test yet…