BUG: SMS Handler not called (OATv3.03)

I have found that the SMSHandler specified when subscribing to the SMS service is not called in OAT v3.03, if the parameter of at+cnmi is set to 2 (i.e. at+cnmi=2,2,0,0,1).

Is this a known issue?
Is it a feature???
Is it fixed in any other OAT version?