RSRP-469381: ReSharper 'Extract Method' shows an incorrect async preview of extracted method

namespace ReSharperBugs.v2018_1
{
    [TestClass]
    public sealed class ExtractMethodTests
    {
        [TestMethod]
        public async Task Test()
        {
            // Extract this part of the method to a new method. START -->
            IClient client = new Client();
            Field[] fields = await client.GetAllFields(CancellationToken.None);
            Dictionary<string, string> types = new Dictionary<string, string>();
            foreach (Field field in fields)
            {
                types.Add(field.Id, "");
            }
            // <-- END

            types.Count.ShouldBe(0);
        }
    }

    public interface IClient
    {
        Task<Field[]> GetAllFields(CancellationToken ct);
    }

    internal class Client : IClient
    {
        public Task<Field[]> GetAllFields(CancellationToken ct)
        {
            throw new NotImplementedException();
        }
    }

    public class Field
    {
        public string Id { get; set; }
    }
}

private static async Task Dictionary()
{
    IClient client = new Client();
    Field[] fields = await client.GetAllFields(CancellationToken.None);
    Dictionary<string, string> types = new Dictionary<string, string>();
    foreach (Field field in fields)
    {
        types.Add(field.Id, "");
    }
    return types;
}

private static async Task<Dictionary<string, string>> Dictionary()
{
    IClient client = new Client();
    Field[] fields = await client.GetAllFields(CancellationToken.None);
    Dictionary<string, string> types = new Dictionary<string, string>();
    foreach (Field field in fields)
    {
        types.Add(field.Id, "");
    }
    return types;
}