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ipv6 dhcp inside AToM

Hello everyone.

I was experimenting with ipv6 dhcp using the following topology:

 7609s ----------mpls core--------  7609s -------SWITCH---------client PC
      \                                           /


Idea of this experiment is that on a first router I have configured ipv6 dhcp server for vrf CLIENT. dhcp server was enabled on a SVI inside vrf, which also serves as AC for vpws. So I was trying to emulate L2 connectivity between a client and a server. VPWS works, L2 connectivity exists, static dual stack was successfully tested. But a strange behavior is observed with ipv6 dhcp design both for managed and other  flags. Specifically RA messages are lost. In a router debug RA are sent to FF02::1 address but never reach a client (wireshark). Although other dhcp parameters like domain name, dns servers or ipv6 address (managed flag) are received without a problem. Client doesn't see a router.
So are the messages sent to FF02::1 address transparently passed through vpws?