softhsm unrwapped key bytes

I am trying to retrieve the key bytes of a wrapped key. We are using IAIK with SoftHSM 2.4.0.
 
When I unwrap the key, the key object returned but when we get the key bytes, I get null.

Key template has been initialized with "sensitive=false" and below code works find with the Thales HSM appliance, but not with SoftHSM.

    long CKM_AES_KEY_WRAP = 0x00002109L;
         Mechanism wrappingMechanism = new Mechanism(CKM_AES_KEY_WRAP);
        InitializationVectorParameters ivParam = new InitializationVectorParameters(iv);
        wrappingMechanism.setParameters(ivParam);
        AESSecretKey key = session.unwrapKey(wrappingMechanism, keyEncryptionKey, wrappedKey, keyTemplate);
    byte[] plaintextkey = key.getValue().getByteArrayValue();
    
Error I'm getting:
 (plaintextkey is null)

Any ideas or workaround to get this to work?  Any input is much appreciated.