I’m not using normals, I’m simply baking textures to avoid the lighting system (and to provide better results.) Not sure why some tris are missing here.
The editor and engine are different so even if it would be nice for both of them to be exact there will probably always be cases where they render differently / handle model data differently.
This could be the model itself or something else. A sample would be needed to test. Try putting the model into the RenderCam sample project to see if it still renders incorrectly there.