constraints remain "NOT VALIDATED" after dbms_redefinition

Hello community,

I have to alter tables with basicfil-LOBs to use securefile-LOBs. I use the dbms_redefinition package for this and the only modification i do is the lob-store-Parameter:

  DBMS_REDEFINITION.REDEF_TABLE(
      uname         => table_rec.owner,
      tname         => table_rec.table_name,
      lob_store_as  => 'SECUREFILE');

After successful finish of the procedure, I noticed that the most constraints remain as "not validated".
In a second step, I need to validate these constraints.

According to Doc ID 18549238.8 and Bug 13526773, the problem should be fixed in 12.1.0.1 already. (We are running 12.1.0.2)
Is there a way to avoid the invalidation of these constraints?

best regards