Why IsTypePresent(Microsoft.UI.Xaml.Controls.WebView2) isn't True ?

[sigmarsson]

<UserControl
    x:Class="Weather.History.Mvvm.Views.AppEventView"
    xmlns:prismmvvm="using:Prism.Mvvm"
    prismmvvm:ViewModelLocator.AutowireViewModel="True"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:winuiwebview2="http://schemas.microsoft.com/winfx/2006/xaml/presentation?IsTypePresent(Microsoft.UI.Xaml.Controls.WebView2)"/>

        <!--WinUI-->
        <winuiwebview2:ContentControl Content="{x:Bind ViewModel.MyWebView}" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"/>

Why is that ContentControl omitted ? For the same type IsTypeNotPresent returns True.