Just got this back from Cisco TAC:
... "due to the important change required to solve this problem, this defect is targeted to be fixed in 2.1(2a). 2.1(2) is not yet a committed release, but we currently expect it in the first half of 2013 (tentatively Q1). This particular defect, CSCtu17983, is one that we understand is important and are currently looking to address in that release, but it is still under investigation."