Memory leak in install packages

[mikenorgate]

I am using the NuGet.PackageManagement package to to manually install some packages in an application that I'm creating and noticed that a lot of the objects that are created during the install process aren't able to be garbage collected due to what seems to be a recursive reference in the async state machine.

The issue seems to stem from this call from my code

await _packageManager.InstallPackageAsync(_project, packageIdentity, _resolutionContext, _projectContext, _repositories, Array.Empty<SourceRepository>(), CancellationToken.None).ConfigureAwait(false);

When investigating this it seems that the retention paths for at lot of the objects come down to two branches

Looking into those paths I can see that the AsyncStateMachineBox appears to have a reference two itself which appears to be blocking the garbage collector

Any ideas what might cause this?