[Bug] Custom font not displaying correctly when loading the page again

Description

I'm trying to use a custom glyph font. It works the first time that the View appears, but the second time a rectangle with a X inside will be rendered instead.

Steps to Reproduce

1. I simply created a font online using the IconMoon web app.
2. I added the font to the Android project normally, adding as AndroidAsset.
3. I created a simple IconLabel extending Label.
4. After that I added two resources in the App.xaml file:

<OnPlatform x:Key="Font.Glyph" x:TypeArguments="x:String">
     <On Platform="Android" Value="Fonts/project_icons.ttf#ProjectIcons"/>
     <On Platform="iOS" Value="ProjectIcons"/>
 </OnPlatform>

<Style TargetType="{x:Type n:IconLabel}">
    <Setter Property="FontFamily" Value="{StaticResource Font.Glyph}"/>
    <Setter Property="FontSize" Value="40"/>
    <Setter Property="TextColor" Value="{DynamicResource Color.Foreground}"/>
</Style>

5. I have a ContentPage that displays multiple ContentViews. When changing the content view being displayed (back and forth), after the displaying the glyphs correctly one time, all subsequent displays will have the incorrect glyph.

Basic Information

• Version with issue:
• Last known good version: n/a
• IDE: Visual Studio for Windows. 16.1.4
• Platform Target Frameworks: Only tested in Android.
  • iOS: n/a
  • Android: 9 (pie)
  • UWP: n/a
• Android Support Library Version: 28
• Nuget Packages:
  Rg.Plugins.Popup 1.1.5.188 MyApp
  Microsoft.EntityFrameworkCore 2.2.4 MyApp
  Polly 7.1.0 MyApp
  Microsoft.EntityFrameworkCore.Sq... 2.2.4 MyApp
  Xamarin.FFImageLoading 2.4.11.982 MyApp
  NodaTime 2.4.5 MyApp
  Microsoft.EntityFrameworkCore.De... 2.2.4 MyApp
  Xamarin.Forms.GoogleMaps 3.2.0 MyApp
  Sharpnado.Forms.HorizontalListView 1.1.0 MyApp
  Xamarin.FFImageLoading.Forms 2.4.11.982 MyApp
  Plugin.Permissions 5.0.0-beta MyApp
  Xam.Plugin.Connectivity 3.2.0 MyApp
  Xamarin.FFImageLoading.Transform... 2.4.11.982 MyApp
  CarouselView.FormsPlugin 5.2.0 MyApp
  DLToolkit.Forms.Controls.FlowLis... 2.0.11 MyApp
  Forms.Controls.FlexButton 0.9.1 MyApp
  fusillade 2.0.5 MyApp
  Ideine.ModernHttpClient 3.2.2 MyApp
  DLToolkit.Forms.Controls.TagEntr... 1.0.5 MyApp
  Microsoft.EntityFrameworkCore.Tools 2.2.4 MyApp
  MLToolkit.Forms.SwipeCardView 2.0.0 MyApp
  Xam.Plugin.Media 4.0.1.5 MyApp
  Xamarin.Essentials 1.1.0 MyApp
  NETStandard.Library 2.0.3 MyApp
  Xamarin.Forms.PancakeView 1.0.21 MyApp
  Refit 4.7.9 MyApp
  Xamarin.Forms 4.0.0.482894 MyApp
  DLToolkit.Forms.Controls.ImageCr... 1.0.7 MyApp
  CarouselView.FormsPlugin 5.2.0 MyApp.iOS
  DLToolkit.Forms.Controls.FlowLis... 2.0.11 MyApp.iOS
  DLToolkit.Forms.Controls.ImageCr... 1.0.7 MyApp.iOS
  DLToolkit.Forms.Controls.TagEntr... 1.0.5 MyApp.iOS
  Forms.Controls.FlexButton 0.9.1 MyApp.iOS
  Plugin.Permissions 5.0.0-beta MyApp.iOS
  Rg.Plugins.Popup 1.1.5.188 MyApp.iOS
  Sharpnado.Forms.HorizontalListView 1.1.0 MyApp.iOS
  Xam.Plugin.Media 4.0.1.5 MyApp.iOS
  Xamarin.FFImageLoading 2.4.11.982 MyApp.iOS
  Xamarin.FFImageLoading.Forms 2.4.11.982 MyApp.iOS
  Xamarin.FFImageLoading.Transform... 2.4.11.982 MyApp.iOS
  Xamarin.Forms 4.0.0.482894 MyApp.iOS
  Xamarin.Essentials 1.1.0 MyApp.iOS
  Xamarin.Forms.GoogleMaps 3.2.0 MyApp.iOS
  CarouselView.FormsPlugin 5.2.0 MyApp.Android
  DLToolkit.Forms.Controls.FlowLis... 2.0.11 MyApp.Android
  DLToolkit.Forms.Controls.ImageCr... 1.0.7 MyApp.Android
  DLToolkit.Forms.Controls.TagEntr... 1.0.5 MyApp.Android
  Forms.Controls.FlexButton 0.9.1 MyApp.Android
  Plugin.Permissions 5.0.0-beta MyApp.Android
  Rg.Plugins.Popup 1.1.5.188 MyApp.Android
  Sharpnado.Forms.HorizontalListView 1.1.0 MyApp.Android
  Xam.Plugin.Media 4.0.1.5 MyApp.Android
  Xamarin.FFImageLoading 2.4.11.982 MyApp.Android
  Xamarin.FFImageLoading.Forms 2.4.11.982 MyApp.Android
  Xamarin.FFImageLoading.Transform... 2.4.11.982 MyApp.Android
  Xamarin.Forms 4.0.0.482894 MyApp.Android
  Xamarin.Android.Support.Design 28.0.0.1 MyApp.Android
  Xamarin.Android.Support.v7.AppCo... 28.0.0.1 MyApp.Android
  Xamarin.Android.Support.v4 28.0.0.1 MyApp.Android
  Xamarin.Android.Support.v7.CardView 28.0.0.1 MyApp.Android
  Xamarin.Android.Support.v7.Media... 28.0.0.1 MyApp.Android
  Xamarin.Android.Support.Core.Utils 28.0.0.1 MyApp.Android
  Xamarin.Android.Support.CustomTabs 28.0.0.1 MyApp.Android
  Xamarin.Essentials 1.1.0 MyApp.Android
  Xamarin.Forms.GoogleMaps 3.2.0 MyApp.Android
  Xamarin.GooglePlayServices.Location 60.1142.1 MyApp.Android
• Affected Devices: Nokia 6.1 Plus, works normally when debugging in emulator.

Screenshots

This is the result:

Reproduction Link

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