IsEnabled Binding converter triggers only after sorting

[SwiftExtender]

I have Datagrid like

<DataGrid Grid.Row="1" x:Name="mgrid" ItemsSource="{Binding MacrosGridData}" Margin="10,10,10,30" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" BorderThickness="2"  BorderBrush="Gray">
	<DataGrid.Columns>
		<DataGridTextColumn Header="Name"  Binding="{Binding Name}"/>
		<DataGridCheckBoxColumn Header="Active" Binding="{Binding IsActive}"/>
		<DataGridTextColumn Header="Checksum" Binding="{Binding Checksum}" />
		<DataGridTemplateColumn Header="Actions">
			<DataGridTemplateColumn.CellTemplate>
				<DataTemplate>
					<DockPanel>
						<Button Content="Save" IsEnabled="{Binding Name, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" Command="{Binding $parent[DataGrid].DataContext.SaveMacrosCommand}" CommandParameter="{Binding .}"/>
						<Button Content="Delete" Command="{Binding $parent[DataGrid].DataContext.RemoveMacrosCommand}" CommandParameter="{Binding .}"/>
					</DockPanel>
				</DataTemplate>
			</DataGridTemplateColumn.CellTemplate>
		</DataGridTemplateColumn>
	</DataGrid.Columns>
</DataGrid>

As you see i trying to disable button if Name is empty but after filling Name value Save button still disabled. If i sort DataGrid by any column Save button become enabled.

Before sorting

After sorting

I using Avalonia 11.3.12 and Avalonia.Controls.DataGrid 11.3.12