Using CreateFromStringAttribute breaks build

[SuperJMN]

Current behavior

Using a class adorned with CreateFromStringAttribute and using it in XAML (as string) breaks all the heads (except UWP).

Expected behavior

The attribute should make the XAML parser instantiate an instance of the adorned class using the string provided in XAML

How to reproduce it (as minimally and precisely as possible)

1. Extract this solution: Repro.zip
2. Build and run for UWP: it will run perfectly
3. Build and run for WASM and Android: the build is broken

Environment

Nuget Package:

Package Version(s):
2.1.0-dev.481

Affected platform(s):

Confirmed on Android and WebAssembly. iOS is likely to be affected, too.

• iOS
• Android
• WebAssembly
• WebAssembly renderers for Xamarin.Forms
• Windows
• Build tasks
• Solution Templates

Visual Studio:

• 2017 (version: )
• 2019 (version: )
• for Mac (version: )

Relevant plugins:

• Resharper (version: 2019.3.1)