We are using the method ReadStreamResult.MoveNextAsync() and the property ReadStreamResult.Current.
Those members disappeared from the ReadStreamResult class in the update 22.0.0.
What approach we should use as an replacement?
There is no word about this breaking change in the Chanelog.
You can call result.GetAsyncEnumerator() to get the IAsyncEnuemerator<T> API. Don’t forget to Dispose it, otherwise you may experience a resource leak on the server.