initialTopMostItemIndex not working on second rendering

[Ananta-Paul]

return (
<Virtuoso
ref={virtuosoRef}
initialTopMostItemIndex={lastMessageIndex}
totalCount={messages.length}
itemContent={(index) => (

{messages[index].content}

)}
/>
);

When I render it for first time it's showing the bottom part but after reloading it's showing the top part of messages list how to fix it to show the bottom part in every rendering

[Ananta-Paul]

I got it thanks