AssemblyLoadContext Will Not Unload

Question

I have created a test application that utilizes the relatively new AssemblyLoadContext object. My issue now is that despite me doing everything I could find in the documentation. It does not unload. There isn't that much room for error, as all I am doing is loading then trying to unload.

private void FileWatcher_OnServerPluginLoaded(object sender, string e)
{
    AssemblyLoadContext alc = new AssemblyLoadContext("meme", true);

    WeakReference testAlcWeakRef = new WeakReference(alc);

    Assembly assembly = null;

    using (var fs = File.Open(e, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
    {
        assembly = alc.Default.LoadFromStream(fs);
    }

    assembly = null;

    alc.Unload();

    GC.Collect();

    while (testAlcWeakRef.IsAlive)
    {
        GC.Collect();
        GC.WaitForPendingFinalizers();
    }
}