Bridge Groups And Double Tagging

It doesn't work.

For reference, here's a standard bridging config. For a reason I haven't confirmed yet, it won't communicate on the double tagged interface.

bridge irb
bridge 1 protocol ieee
bridge 1 route ip
!
interface BVI1
 ip address 10.10.10.10 255.255.255.0
!
interface GigabitEthernet8.2000
 encapsulation dot1q 10 second-dot1q 2000
 bridge-group 1
!