A bug in my version of SW?

In a Part document, specifying a Reference Geometry Axis through a Point on a Face has different outcomes depending on:-

     If the part is saved as a part, then the axis will rebuild correctly on opening, but

     If the part is saved as a part template, then the axis will fail to rebuild correctly on opening.

However, if the axis is defined by the intersection of 2 planes, then the outcomes are always a correct rebuild.

SolidworksParts And Features