Assembly feature left a part with an invisible face

Have a look at the attached pictures. In an assembly I used a hole wizard feature to cut a hole in the invisible face. I then used a linear pattern at the assembly level to pattern the hole at a spacing of three inches. Both features are propagated to the part. After the creation of the pattern the face appeared 'see through'.

Does anyone know what is happening here?

SolidworksAssemblies