'getItem' is final and cannot be overriden

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Step 2: Describe your environment

Android device: Android 13+
Android OS version: target sdk 34
Google Play Services version: _____
Firebase/Play Services SDK version: 33.1.0
FirebaseUI version: 8.0.2

Step 3: Describe the problem:

I am unable to override getItem function when extending the FirestorePagingAdapter. The build fails saying 'getItem' is final and cannot be overriden. I need to override getItem because I am trying to insert a header item in the list.

Steps to reproduce:

Observed Results:

What happened? This could be a description, logcat output, etc.

Build fails:

Expected Results:

What did you expect to happen?

Expected to be able to override this function as it is marked protected in PagingDataAdapter class

Relevant Code:

class VideoFirebaseAdapter(var context: Context,
                                    private var showCategory: Boolean = true,
                                    options: FirestorePagingOptions<VideoMetadata>,
                                    private val hasHeader:Boolean = false)
    :FirestorePagingAdapter<VideoMetadata, RecyclerView.ViewHolder>(options) {

    private val TYPE_HEADER = 0
    private val TYPE_ITEM = 1

    val TAG = "VideoAdapter"

    var config = ImageLoaderConfiguration.Builder(this.context)
            .build()!!

    private val loader: ImageLoader = ImageLoader.getInstance()

    init {
        loader.init(config)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        return if (hasHeader && viewType == TYPE_HEADER) {
            getHeaderVH(parent, viewType)!!
        } else {
            val itemView = LayoutInflater.from(context).inflate(R.layout.video_item, parent, false)
            VideoListItemVH(itemView, showCategory, context, loader)
        }
    }

    abstract fun getHeaderVH(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder?

    override fun getItemViewType(position: Int): Int {
        return TYPE_ITEM
        return if (hasHeader && position == 0)
            TYPE_HEADER
        else
            TYPE_ITEM
    }

    override fun getItemCount(): Int {
        return if (hasHeader)
            super.getItemCount() + 1
        else
            super.getItemCount()
    }

  //  fails to override saying getItem is final
  override fun getItem(position: Int): DocumentSnapshot? {
        if(hasHeader) {
            if(position==0) return super.getItem(0) // This will be ignored!
            return super.getItem(position-1)
        }
        return super.getItem(position)
    }

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int, video: VideoMetadata) {
        if (hasHeader && holder !is VideoListItemVH) {
            return
        } else {
            (holder as VideoListItemVH).bind(video)
        }
    }
}

firebase / FirebaseUI-Android