Kotlin: findFirstVisibleItemPosition() also returns last visible item

Question

For practice I am trying to replicate call logs app.

I want to show floating date, like this:

I'm using findFirstVisibleItemPosition() for getting date, but it is not returning the top most item.

When I scroll to last it also returns last most item. Why so? Is there any other method??

See: https://youtu.be/Wum5h73Qqf0 Note: I'm using recyclerview in only half screen that's why I recorded only half screen.

        binding.listRecentCalls.addOnScrollListener(object : RecyclerView.OnScrollListener() {
        override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
            if (dy > 0 || dy < 0) {
              val firstVisible = (recyclerView.layoutManager as LinearLayoutManager).findFirstVisibleItemPosition()
              binding.tvScrolledDate.text = logsList[firstVisible].date
              binding.tvScrolledDate.visibility = View.VISIBLE
            }
        }
    })