[Bug] Java.Lang.NullPointerException when trying to preview CarouselPage

Description

If I change a page in my application to inherit from Xamarin.Forms.CarouselPage, the Xamarin.Forms Previewer crashes when attempting to preview it with a Java.Lang.NullPointerException. There does not appear to be any way to copy the stack trace text from a Xamarin.Forms previewer crash (which is another major issue in and of itself), so I've included the best I can do with screenshots below. Note that this happens even with CarouselPage.Children provided in XAML and with pages included in it; I've omitted that specific markup for brevity as the crash happens regardless.

Steps to Reproduce

Add a page and have it inherit from CarouselPage.
Open the XAML Previewer
The previewer will crash after a few seconds and say "An exception occurred while rendering the control."

Expected Behavior

The page will preview normally

Actual Behavior

The previewer crashes and does not render any sort of preview.

Basic Information

Version with issue: 4.4.0.991640
Last known good version: Unsure
IDE: Visual Studio 2019 v16.4.5; Xamarin extension v16.4.000.311; Xamarin Designer extension v16.4.0.475
Platform Target Frameworks:
- Android: target API level 28
Android Support Library Version: v28.0.0.3

Nuget Packages:

<PackageReference Include="Acr.UserDialogs" Version="7.0.35" />
<PackageReference Include="Microsoft.Extensions.Configuration" Version="3.1.2" />
<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.1.2" />
<PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="3.1.2" />
<PackageReference Include="Portable.Ninject" Version="3.3.1" />
<PackageReference Include="Realm" Version="4.3.0" />
<PackageReference Include="Refractored.XamForms.PullToRefresh" Version="2.4.1" />
<PackageReference Include="Telerik.UI.for.Xamarin" Version="2020.1.218.1" />
<PackageReference Include="Xam.Plugin.Media" Version="4.0.1.5" />
<PackageReference Include="Xamarin.Forms" Version="4.4.0.991640" />
<PackageReference Include="Xamarin.Essentials" Version="1.4.0" />
<PackageReference Include="Xamarin.Forms.Maps" Version="4.4.0.991640" />
<PackageReference Include="Xamarin.Forms.Visual.Material" Version="4.4.0.991640" />

Screenshots

Exception thrown:

Previewer and source code after crash:

Reproduction Link

https://gist.github.com/briman0094/30ceca84bce276174e09a27efba640e0

Workaround

It seemed like for a while that removing all bin/obj folders and rebuilding would allow the view to render once, but it doesn't seem like this reliably allows it to render.

xamarin / Xamarin.Forms