What IOS are you running on your Supervisor 2T? As long as it's 15.0(1)SY1 or later you should be OK. (Reference).
If it's not working with that I'd try reload of the ASA SM module (from IOS cli - e.g. "hw-module <module#> reset" and, failing that, "no power-enable module <module#>" followed by "power-enable module <module#>) while the new Supervisor is installed. Watch the log for relevant messages during that process.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...