Steps to Reproduce

We're having an issue with a Xamarin project, which as we added System.IO.Packaging 4.4.1 nuget package dependency, the reference is resolved as the ref/netstandard1.3 DLL, a reference assembly. It seems that because of that, the Xamarin app fails to start because this DLL does not get packaged, and so the app fails to start with this common xamarin error https://forums.xamarin.com/discussion/63584/android-could-not-load-assembly-xxx-during-startup-registration

There seems to be an issue open related to that https://github.com/dotnet/corefx/issues/23830

Expected Behavior

The application starts correctly.

Actual Behavior

The application fails to start with the "Could not load assembly 'xxx' during startup registration" error.

Version Information

VS 15.5.2
Xamarin 4.8
Xamarin.Android 8.1

VS bug #580833