DHCPv6 host route in client side

Hello everyone
I am studing DHCPv6 and I am having trouble with the prefix my client is
taking.
On my server I have the following config:

SERVER f0/0 ------f0/0 CLIENT

SERVER SIDE:
interface FastEthernet0/0
 no ip address
 duplex full
 speed auto
 ipv6 address 1991:11::1/64
 ipv6 nd autoconfig prefix
 ipv6 dhcp server TST
 !
end

!
ipv6 unicast-routing
ipv6 cef
ipv6 dhcp pool TST
 address prefix 1991:11::/64
 domain-name cisco.com

CLIENT SIDE

!
interface FastEthernet0/0
 no ip address
 duplex full
 ipv6 address dhcp
 ipv6 enable
 ipv6 nd autoconfig prefix
 ipv6 nd managed-config-flag
 !
end

Client does takes an IP but this one is a host route

CLIENT(config-if)#do sh ipv6 route
IPv6 Routing Table - default - 2 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, M - MIPv6, R - RIP, I1 - ISIS L1
       I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
       EX - EIGRP external, ND - Neighbor Discovery
       O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
LC 1991:11::39E9:5DFD:BAFC:944A/128 [0/0]
     via FastEthernet0/0, receive
L FF00::/8 [0/0]
     via Null0, receive

I did a bit of research and I found it is a bug and that ipv6 nd autoconfig
prefix command will istall a /64 since thats what I have in my pool.But this
is not working.

Can you guys help me out with this please? I tested this on 12.4T (Real gear)
and 15.0M (GNS3) and same behaivor

---
Daniel Barney Briseqo
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