Screen Space - Overlay and no Anti-aliasing

Creating meshes in UI canvas where the canvas is set to overlay results in jaggies (aliasing)... whereas if screen space - camera setting is used, anti-aliasing is working properly.

Is this a new problem or just something I never noticed before?

I filed a bug incase... seems similar to this help request: http://answers.unity3d.com/questions/1391120/anti-aliasing-not-working-in-unity-56-ui-with-scre.html