Xamarin.Android regression?

[freever]

Has there been a regression on #1886 ? iOS is still OK but my Xamarin.Android app has suddenly started throwing out the same old errors:

Can not resolve reference: System.Threading.Tasks.Extensions, referenced by System.IO.Pipelines. Please add a NuGet package or assembly reference for System.Threading.Tasks.Extensions, or remove the reference to System.IO.Pipelines

Can not resolve reference: System.Threading.Tasks.Extensions, referenced by Microsoft.AspNetCore.SignalR.Client.Core. Please add a NuGet package or assembly reference for System.Threading.Tasks.Extensions, or remove the reference to Microsoft.AspNetCore.SignalR.Client.Core.

Can not resolve reference: System.Threading.Tasks.Extensions, referenced by System.Threading.Channels. Please add a NuGet package or assembly reference for System.Threading.Tasks.Extensions, or remove the reference to System.Threading.Channels.

Can not resolve reference: System.Threading.Tasks.Extensions, referenced by Microsoft.AspNetCore.Http.Connections.Client. Please add a NuGet package or assembly reference for System.Threading.Tasks.Extensions, or remove the reference to Microsoft.AspNetCore.Http.Connections.Client.

I am on he latest versions of everything:

• SignalR.Client 1.0.3
• VS 15.9.0 Preview 1.0 (Xamarin.Android 9.1.0.12)
• VS Mac 7.8 Preview (Xamarin.Android 9.1.0.12)

My build server is running a few versions behind and does not have the same build error:

• VS Mac 7.6 (Xamarin.Android 9.0.0)

Locally I am running the latest betas so I might be the canary in the coal mine?

[KSemenenko]

Try to remove the app.config from the project. It helped me for Xamarin.iOS and Xamarin.Andoird

[freever]

Turns out it isn't related to the Xamarin.Android version as reverting to stable channel makes no difference. I am able to build in Release mode, just not in Debug. So I dunno.