Application Continuity not working as expected

I have a 2 instance 12.1.0.2.170418 RAC database called "alwayson" on RHEL 6 servers.

My database service is created with this syntax:

srvctl add service -d alwayson -s alwayson_sv -preferred alwayson1 -available alwayson2 -failovertype TRANSACTION -replay_init_time 300 -failoverretry 30 -failoverdelay 3 -commit_outcome TRUE

In my test, I created a small table, insert a row, failover the service and shutdown the alwayson1 instance, then attempt to commit the transaction on the failed-over session.

QUESTION: Why am I getting "ORA-25402: transaction must roll back" on failed-over transaction.  What's the point if you can't seamlessly continue a transaction?

SQL> select instance_name from v$instance;