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I believe I have found a bug associated with the use of the manual zoom function .zoomin in conjunction with the use of enableTimelineVirtualization:tru on the ej2 Gantt chart control.
The attached solution and video file illustrate the behavior. If the zoomIn fuction is called multiple times, the horizontal scroll of the gantt chart will stop working.
Note that the in-built ZoomIn toolbar item does not seem to be impacted.