update fails

I checked it more than once, and I don't understand it:

Doing an update, then checking the updated value, and finding it not updated (but still the old value). I know these are special tables (it's Support that asked me to run this statement).

Why is it not working correctly ?

Both statements are performed directly after each other, same session:

SQL> update sys.metaview$ set properties = 137  where viewname = 'KU$_EXP_PKG_BODY_VIEW';

1 row updated.

SQL> select viewname,properties from sys.metaview$ where viewname = 'KU$_EXP_PKG_BODY_VIEW';

VIEWNAME

--------------------------------------------------------------------------------

PROPERTIES

----------

KU$_EXP_PKG_BODY_VIEW

   1161

SQL>