ArrayAdapter won't update after first suggestion with AutoCompleteTextView

Question

I try to use AutoCompleteTextView with ArrayAdapter. everything works correctly before first try to use AutoCompleteTextView. after the first try, just AutoCompleteTextView shows the last selection (and in this case your first try with AutoCompleteView). I think with clear() and notifyDataSetChanged() must be ok but after clear() and notifyDataSetChanged() still I have problem. I search for the same question and everything was same but still have problem

this is my adapter:

class CityAutoCompleteAdapter(
    context: Context,
    cityList: ArrayList<CityModel>
) : ArrayAdapter<CityModel>(context, 0, cityList) {

    var cityListFull: ArrayList<CityModel> = cityList

    private var cityFilter: Filter = object : Filter() {
        override fun performFiltering(constraint: CharSequence?): FilterResults {

            val results = FilterResults()
            val suggestions: ArrayList<CityModel> = arrayListOf()

            if (constraint == null || constraint.isEmpty()) {
                suggestions.addAll(cityListFull)
            } else {
                val filterPattern: String = constraint.toString().toLowerCase().trim()

                for (item in cityListFull) {
                    if (item.cityName.toLowerCase().contains(filterPattern)) {
                        suggestions.add(item)
                    }
                }
            }
            results.values = suggestions
            results.count = suggestions.size

            return results
        }

        override fun publishResults(constraint: CharSequence?, results: FilterResults?) {


            if (results != null) {
                //@Suppress("UNCHECKED_CAST")
                addAll(results.values as? List<CityModel> ?: cityListFull)
                notifyDataSetChanged()
            }

        }

        override fun convertResultToString(resultValue: Any?): CharSequence {
            val result = resultValue as CityModel
            return result.cityName
        }
    }

    override fun getFilter(): Filter {
        return cityFilter
    }


    override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {

        var newConvertView = convertView

        if (convertView == null) {
            newConvertView = LayoutInflater.from(context).inflate(
                R.layout.simple_auto_complete_item, parent, false
            )
        }

        val txtAutoCompleteCityName: TextView =
            newConvertView?.findViewById(R.id.txtAutoCompleteLabel) ?: TextView(context)

        val cityItem: CityModel? = getItem(position)

        if (cityItem != null) {
            txtAutoCompleteCityName.text = cityItem.cityName
        }

        return newConvertView!!
    }
}

and this is my class where I used AutoCompleteView:

 cityAdapter = result.success()?.let {
                    CityAutoCompleteAdapter(
                        requireContext(),
                        it
                    )
                }

                binding.layoutFragmentPickupSender.layoutBottomSheetSender.autoAddSenderStateCity.setAdapter(cityAdapter)
                cityAdapter?.notifyDataSetChanged()


    binding.layoutFragmentPickupSender.layoutBottomSheetSender.autoAddSenderStateCity.onItemClickListener =
            OnItemClickListener { adapterView, view, pos, id -> //this is the way to find selected object/item
                selectedCity = adapterView.getItemAtPosition(pos) as CityModel
                cityAdapter?.notifyDataSetChanged()
            }

may please guide me where I make a mistake?