map.centerAndZoom(pt, 0.1);
Same issue. I'm trying to centerAndZoom on a dynamic map service and regardless of what value I use for factor it zooms out twice as far (2.0).
map.setExtent(map.extent.centerAt(pt); map.setExtent(map.extent.expand(0.1));
I've also now experienced this issue, and it's still broken in 2.8 as well.