Popup RG plugins after edit no update for property - xamarin.forms

Question

I am displaying my properties in list. I used to use Acr.UserDialogs to display popup however I have decided to switch to RG for better UI.
Now when I clock on one field and edit it when I go back to the original page the value stay the same as it was before update. I have tried to add RefreshPull but that doesn't help
Back of my page
public DisplayResult(RemoteCallResult<IEnumerable<DocumentData>> data)
{
InitializeComponent();
BindingContext = _resultPageViewModel = new ResultPageViewModel(data);
}
my Xaml
<ListView BackgroundColor="{DynamicResource PageBackgroundColor}" x:Name="list" IsPullToRefreshEnabled="{Binding Update}"
ItemsSource="{Binding Results, Mode=TwoWay}"
SeparatorVisibility="Default"
SelectionMode="None">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid BackgroundColor="{DynamicResource PageBackgroundColor}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="4*"/>
<ColumnDefinition Width="12*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="12*"/>
<ColumnDefinition Width="4*"/>
</Grid.ColumnDefinitions>
<Label Grid.Column="1" Padding="0,3,3,0" Text ="{Binding FieldDescriptor}" Style="{StaticResource SubLabelBlackStyle}" HorizontalOptions="Start" BackgroundColor="{DynamicResource PageBackgroundColor}" HorizontalTextAlignment="Start" />
<Label Grid.Column="3" Padding="0,3,3,0" Text="{Binding FieldValue, Mode=TwoWay}" Style="{StaticResource SubLabelBlackStyle}" HorizontalOptions="Start" BackgroundColor="{DynamicResource PageBackgroundColor}" HorizontalTextAlignment="Start" >
<Label.GestureRecognizers>
<TapGestureRecognizer Command="{Binding BindingContext.EditTextCommand, Source={x:Reference Name=list}}" CommandParameter="{Binding .}"/>
</Label.GestureRecognizers>
</Label>
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
VIEWMODEL
public string FieldValue
{
get => _fieldValue;
set => SetValue(ref _fieldValue, value);
}
public ResultPageViewModel()
{
}
public ResultPageViewModel(RemoteCallResult<IEnumerable<DocumentData>> data)
{
EditTextCommand = new Command<DocumentData>(async (key) => await EditTextAsync(key));
Update = new Command<string>(async (key) => await UpdateValue(key));
LoadText(data); }
public async Task EditTextAsync(DocumentData param)
{
await Navigation.PushPopupAsync(new EditPopUp(param));
}
public async Task UpdateValue(string value)
{
_fieldValue = value;
}
ViewModel POPUP
private readonly ResultPageViewModel _resultPageViewModel;
private string _fieldValue;
public Command ConfirmPopUpCommand { get; }
public string FieldValue
{
set
{
_fieldValue = value;
NotifyPropertyChanged(nameof(FieldValue));
}
get { return _fieldValue; }
}
public EditPopUpViewModel(DocumentData param)
{
_resultPageViewModel = new ResultPageViewModel();
_fieldValue = param.FieldValue;
ConfirmPopUpCommand = new Command(async () => await ExecuteConfirmPopUpCommand());
}
private async Task ExecuteConfirmPopUpCommand()
{
await _resultPageViewModel.UpdateValue(_fieldValue);
await PopupNavigation.Instance.PopAsync(true);
}
POP UP
<Entry x:Name="entryCardName"
FontSize="Small"
Placeholder="{Binding FieldValue}"
Text="{Binding FieldValue}"
TextColor="Black"
ReturnType="Next">
</Entry>

Answer 1

When you show the pop up, I think you should also pass the ViewModel to the popupPage:
public async Task EditTextAsync(DocumentData param)
{
await Navigation.PushPopupAsync(new EditPopUp(param), this);
}
Then in the POPUP, you does not need to create a new one:
public MainPage(DocumentData param, ResultPageViewModel model)
{
_fieldValue = param.FieldValue;
Command ConfirmPopUpCommand = new Command(async () => await ExecuteConfirmPopUpCommand(model));
}
private async Task ExecuteConfirmPopUpCommand(ResultPageViewModel model)
{
await model.UpdateValue(_fieldValue);
await PopupNavigation.Instance.PopAsync(true);
}

Answer 2

this is updating the private internal field, bypassing the setter and NotifyPropertyChanged
public async Task UpdateValue(string value)
{
_fieldValue = value;
}
you want to update the public property that will fire the setter and NotifyPropertyChanged
public async Task UpdateValue(string value)
{
FieldValue = value;
}