MAUI: содержимое Collectionview не отображается при добавлении RefreshView

Я добавил RefreshView вместо CollectionView. После добавления RefreshView содержимое CollectionView не отображается в пользовательском интерфейсе. Содержимое CollectionView видно в пользовательском интерфейсе перед добавлением RefreshView. Ниже приведен код:

<?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" 
    BackgroundColor = "White"
    x:Class = "NeedHelp.Pages.FriendDetailsPage">

    <ContentPage.Content>
        <StackLayout>
            <Grid BackgroundColor = "#eeeeee">
                
            </Grid>

            <ScrollView 
                x:Name = "frienddetails_scrollview"
                IsVisible = "False"
                Orientation = "Vertical" 
                VerticalOptions = "FillAndExpand" 
                HorizontalOptions = "FillAndExpand">
                
                <StackLayout
                    Margin = "15">
                    
                    <Frame 
                        BorderColor = "#efefef"
                        BackgroundColor = "White"
                        CornerRadius = "5"
                        HasShadow = "False"
                        Padding = "5">
                        
                    </Frame>

                    <Frame
                        BorderColor = "#efefef"
                        Padding = "3"
                        x:Name = "map_layout"
                        Margin = "0,5,0,0">
                        
                    </Frame>

                    <Label
                        Margin = "0,5,0,0"
                        x:Name = "History_label"
                        Text = "History"
                        TextColor = "#424242"
                        HorizontalOptions = "Center"
                        HorizontalTextAlignment = "Center">
                    </Label>

                    <Frame
                        x:Name = "Tab_layout"
                        BorderColor = "#efefef"
                        Margin = "0,5,0,0"
                        BackgroundColor = "White"
                        HasShadow = "False"
                        CornerRadius = "5"
                        Padding = "5">

                    </Frame>

                    <ListView 
                        x:Name = "historylistview"
                        SeparatorVisibility = "None"
                        HasUnevenRows = "True"
                        SelectionMode = "None"
                        CachingStrategy = "RecycleElement"
                        BackgroundColor = "#ffffff">
                        <ListView.ItemTemplate>
                            <DataTemplate>
                                <ViewCell>
                                    <ViewCell.View>
                                        <StackLayout
                                            Margin = "0,0,0,10">
                                            
                                        </StackLayout>
                                    </ViewCell.View>
                                </ViewCell>
                            </DataTemplate>
                        </ListView.ItemTemplate>

                        <ListView.Footer>
                            <Label/>
                        </ListView.Footer>
                    </ListView>
                    
                <RefreshView 
                    IsRefreshing = "{Binding IsRefreshing}"
                    Command = "{Binding RefreshCommand}">

                    <CollectionView 
                        x:Name = "MyTweetsList" 
                        Margin = "0,5,0,5"
                        ItemsSource = "{Binding AllItems,Mode=TwoWay}"
                        RemainingItemsThreshold = "0"
                        RemainingItemsThresholdReached = "LoadMoreTweets"
                        HorizontalOptions = "Fill">
                        <CollectionView.ItemTemplate>
                            <DataTemplate>
                                <StackLayout
                                    x:Name = "Item"
                                    HorizontalOptions = "Fill"
                                    VerticalOptions = "FillAndExpand"
                                    Orientation = "Vertical">

                                </StackLayout>
                            </DataTemplate>
                        </CollectionView.ItemTemplate>
                        <CollectionView.HeightRequest>
                            <OnIdiom x:TypeArguments = "x:Double">
                                <OnIdiom.Phone>400</OnIdiom.Phone>
                                <OnIdiom.Tablet>600</OnIdiom.Tablet>
                                <OnIdiom.Desktop>400</OnIdiom.Desktop>
                            </OnIdiom>
                        </CollectionView.HeightRequest>
                    </CollectionView>
                </RefreshView>

                    <Label
                        VerticalOptions = "CenterAndExpand"
                        HorizontalOptions = "CenterAndExpand"
                        IsVisible = "{Binding ComingSoonVisibility}"
                        HorizontalTextAlignment = "Center"
                        Text = "No Messages Yet."
                        x:Name = "no_announcement_label"/>
                </StackLayout>
            </ScrollView>
            
            <Grid 
                x:Name = "tweetBox"
                IsVisible = "False"
                Margin = "0,0,0,10">

            </Grid>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

public ICommand RefreshCommand
{
    get
    {
        return new Command(async () =>
        {
            IsRefreshing = true;
            
            LoadData();
            
            IsRefreshing = false;
        });
    }
}


private bool _isRefreshing = false;
public bool IsRefreshing
{
    get { return _isRefreshing; }
    set
    {
        _isRefreshing = value;
        OnPropertyChanged(nameof(IsRefreshing));
    }
}

Нужно ли мне добавлять что-нибудь еще для просмотра данных в пользовательском интерфейсе при добавлении RefreshView?