EnsureVisible() is the right method to scroll the list to a desired item. If the number of list items changes, the right moment to invoke this method would be after the number has been changed. In case of InvalidateItems(), there should not be any dependency in the order in which the methods are invoked.
Without knowing your implementation it is difficult to deduce the cause of why it is not working. If you can't find the cause of the issue yourself, you can upload in this thread a small example project demonstrating it. We can then analyze it.
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