Google Maps auto pan on draggable objects fails on Mobile all browsers

Google Maps V3 API, all PC-based browsers work fine (map will start to Pan when mouse drags object marker/polygon close to screen boundry) with: - http://ift.tt/1EMUAfn

and: -

http://ift.tt/1HA3NrI

But on a mobile Phone Android (Chrome, FireFox, Opera) or Windows IE11, if you drag the triangles to the edge, the Map refuses to Pan.

With the Marker example in the 2nd link, the Panning seems to work on 3 of the 4 sides.

Does everyone else agree there's a problem? Anyone with a work-around?