Why Executable privielege on TYPE object to DBSNMP while executing space_advisor using DBMS_SPACE pa

Hello Experts,
Please have a look at following test case and comment on "why  Executable privielege on TYPE object to DBSNMP user, while executing space_advisor using DBMS_SPACE, is granted"?

This new behavior is observed only in 11.2.0.3. and for my customer, which is a bank, any user having system privilege with GRANTABLE/ADMIN option is an audit violation .

Test Case:
=========
1. Disabled auto space advisor task

SQL> select client_name,status from Dba_Autotask_Client;

CLIENT_NAME                                                      STATUS
---------------------------------------------------------------- --------
auto optimizer stats collection                                  DISABLED
auto space advisor                                               DISABLED
sql tuning advisor                                               ENABLED

SQL>

2. Identified the object with grantable option for the user DBSNMP.