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Zoom / Pan behavior is designed such that zooming is limited upto a certain region, so that user doesn’t end up zooming into a blank-region (region with no dataPoints). To zoom into a certain region, there should be a minimum of 3-4 dataPoints over the axis. Please refer to this forum thread for more information. Also, one can’t zoom outside the actual axis range (minimum & maximum). In your case, it’s getting cancelled as zooming happens outside the axis range. You can handle this by setting minimum and maximum of charts based on navigator.
stockChart.charts.axisX.set("minimum", stockChart.navigator.axisX.get("minimum"), false);
Please take a look at this updated JSFiddle for working code.