Xamarin.Build.Download.targets - invalid Id

[endarea]

I cannot build the project after adding Xamarin.Firebase.Functions nuget (v120.0.0) . The error message is:

Xamarin.Build.Download.targets(3,3): Error XBD020: Invalid item ID firebaseappcheckinterop-16.0.0-beta01 

What can it be? I already tried the usual things like deleting the bin/obj folders, rebuilding, restarting, installing different versions of Xamarin.Build.Download. No idea where to even start investigating this issue.

[AdamEssenmacher]

I didn't see this issue before opening up a duplicate: #1293

[jpobst]

This should be fixed in #1384.