incorrect centre location for specified layer rectangle

[meh9]

I have a layer def which a large rectangle. When clicking Zoom To it does not correctly centre the view on the specified rectangle, but instead flying to the bottom right quadrant of the layer.

            {
              "name": "Bathymetry topography",
              "layers": "Australian_Bathymetry_Topography",
              "url": "http://www.ga.gov.au/gis/rest/services/marine_coastal/Australian_Bathymetry_Topography/MapServer",
              "type": "esri-mapServer",
              "clipToRectangle": true,
              "rectangle": [
                "90.0",
                "-62.0",
                "174.0",
                "-4.0"
              ]
            }