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When a region is zoomed axisY range gets updated according to the minimum and maximum dataPoints available within the zoomed range. And resetting the range resets the axisY range accordingly. But when a dataSeries is hidden and if you try resetting the zoomed region, it only resets the axes with dataSeries that are visible and not hidden. Resetting in this scenario doesn’t affect the axes with dataSeries that are hidden.
When you zoom in first 4 dataPoints and try to reset it should work fine, but if you zoom in first 4 dataPoints and try to reset after hiding all the dataSeries the axisY range won’t get affected. Because of this behavior axisY2 range doesn’t reset to its initial state. Resetting chart when all the dataSeries are visible should work fine in your case.