RadListPicker - missed selected index property

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="GeneralFeatures.MainPage"
             xmlns:telerikInput="clr-namespace:Telerik.XamarinForms.Input;assembly=Telerik.Maui.Controls.Compatibility"
             BackgroundColor="{DynamicResource SecondaryColor}">

    <Grid>
        <telerikInput:RadListPicker  x:Name="timeTypeListPicker"
                                     VerticalOptions="Start"
                                     ItemsSource="{Binding Items}"
                                     DisplayMemberPath="FullName"
                                     SelectedItem="{Binding SelectedItem, Mode=TwoWay}" />
        
        <Label Text="{Binding StatusText}" 
               VerticalOptions="End"
               HorizontalOptions="Center"
               Margin="10"/>
    </Grid>
</ContentPage>

using System.Collections.ObjectModel;
using Telerik.XamarinForms.Common;

namespace GeneralFeatures;

public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
        BindingContext = new PeopleViewModel();
    }
}

public class PeopleViewModel : NotifyPropertyChangedBase
{
    public Person selectedItem;
    private string statusText;

    public PeopleViewModel()
    {
        Items = new ObservableCollection<Person>()
        {
            new Person("Freda","Curtis"),
            new Person("Jeffery","Francis"),
            new Person("Ema","Lawson"),
            new Person("Niki","Samaniego"),
            new Person("Jenny","Santos"),
            new Person("Eric","Wheeler"),
            new Person("Emmett","Fuller"),
            new Person("Brian","Johnas"),
        };

        SelectedItem = Items[3];
    }

    public ObservableCollection<Person> Items { get; set; }

    public Person SelectedItem
    {
        get => selectedItem;
        set
        {
            if (UpdateValue(ref selectedItem, value))
            {
                var selectedIndex = Items.IndexOf(selectedItem);
                StatusText = $"Selected Index: {selectedIndex}";
            }
        }
    }

    public string StatusText 
    { 
        get => statusText; 
        set => UpdateValue(ref statusText, value); 
    }
}

public class Person
{
    public Person(string name, string lastName)
    {
        Name = name;
        LastName = lastName;
    }

    public string Name { get; set; }

    public string LastName { get; set; }

    public string FullName => $"{Name} {LastName}";
}