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SfGantt - Problem with EnableVirtualization if FrozenColumns is Set

I have observed some unexpected behaviour when using EnableRowVirtualization / EnableColumnVirtualization / EnableTimelineVirtualization with Frozen Columns on an SfGantt chart.

If SfGantt.FrozenColumns property is set, the vertical scrollbar only allows scrolling through first couple of pages of tasks.  If it is not set, the scrollbar allows scrolling through all records.  It is possible to continue scrolling with the mouse scroll wheel, but it often causes problems with mismatched rows between columns and timeline sections.

I went through the documentation and could not find anything that indicated FrozenColumns should not be used with virtualization.