Listview items ItemVisibilityEventArgs erroneous behavior

I am trying to do tasks based on item visibility in listview in Xamarin Forms, but this functionality is erroneous or I am doing it wrong.

Example: I have 30 items in listview, though i can only see 7 items at a time, ItemVisibilityEventArgs is triggered for 15 items at first, and then when I scroll down further items are triggered even before they are visually rendered in the application.

Same case with item disappearing event. The event is not triggered on first item in listview until 7th or 8th item comes to top of visible items.

Kindly guide me on how to effectively use these elements.


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