I don't know if a solution was found but I have the same issue that my Cisco 2960XR is not using the source-interface. It is like it is ignoring the command. Configuration is working fine with all our other Cisco devices.
Running ver - 15.0.(2) EX5 and cannot see anything on any bug lists.
Login to the FXOS chassis manager.
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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...