Zoom to layer with clustered points

The latest beta11 release doesn't seem to work if you have a layer of clustered points and "zoom to layer" behaviour. The zoom treats the clustered layer as if it was a single point, the last one in the list.

I attach screen shots of one of my applications, showing places near Worthing using a clustered points layer. The beta11 code zooms into the last (furthest away) point rather than the centroid of the polygon that encloses the displayed points and clusters.