RAC OPTION OFF after upgrade to 12.1

Oh, The Irony!

Reference Doc ID 2494637.1 has all the details.

dba_registry shows OFF while database parameters show ON.

SQL> select comp_name,version,status from dba_registry;
COMP_NAME                                          VERSION                        STATUS
Oracle Real Application Clusters                   12.1.0.2.0                     OPTION OFF


Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Advanced Analytics and Real Application Testing options

SQL> show parameter cluster
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
cluster_database                     boolean     TRUE
cluster_database_instances           integer     2