Unable to import a key into KeyNumber.Signature with RSACryptoServiceProvider

Hi all,The other day a customer of mine was having an issue when importing key pairs with .NET's RSACryptoServiceProvider. When setting KeyNumber parameter to KeyNumber.Exchange everything seems to be fine. But when setting the KeyNumber parameter to KeyNumber.Signature the key pair is imported to the KeyNumber.Exchange slot just as if you haven’t set the KeyNumber parameter. I could reproduce