It's not a problem with the ASA but to do with how OSPF advertises loopback addresses. By default OSPF advertises loopback addresses as /32's regardless of the subnet mask you actually use. If you want to to advertise the subnet mask as well you need to add the following to your config
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...