RMAN rename datafile created in an archivelog

Question

I'm trying to restore an Oracle database (11.2.0.4.0) to a test system with a different file layout. The production database is being backed up using RMAN, no catalog. We do a full backup of all the datafiles on Sunday (last one being Mar 9th) and then only backup the archivelogs every night during the week.

On 3/9 we had 11 datafiles. On 3/12 I created a new tablespace/datafile. When doing the restore today my general process has been:

1. Install Oracle software only, no initial database
2. Restore the SPFILE to a PFILE from the 3/9 backup and edit it. This is where I change the DB_DOMAIN and the new locations of the control files on the test server.
3. Startup nomount with the new PFILE.
4. Restore the control file from the 3/9 backup.
5. Mount the database. Using sqlplus I rename the redo logs to their new location.
6. Since the restored control files aren't aware of the backup pieces for 3/10 - 3/14, I run this for each missing day: CATALOG BACKUPPIECE '/path/to/backuppiece.bkp'

7. Finally I run this RMAN command to restore/recover the database (getting the SCN from LIST BACKUPSET):

   RUN
   {
   SET UNTIL SCN 426265698;
   SET NEWNAME FOR DATAFILE 1 TO '/var/oracle/data/orcl/system01.dbf';
   SET NEWNAME FOR DATAFILE 2 TO '/var/oracle/data/orcl/sysaux01.dbf';
   SET NEWNAME FOR DATAFILE 3 TO '/var/oracle/data/orcl/undotbs01.dbf';
   SET NEWNAME FOR DATAFILE 4 TO '/var/oracle/data/orcl/users01.dbf';
   SET NEWNAME FOR DATAFILE 5 TO '/var/oracle/data/orcl/foo01.dbf';
   SET NEWNAME FOR DATAFILE 6 TO '/var/oracle/data/orcl/foo02.dbf';
   SET NEWNAME FOR DATAFILE 7 TO '/var/oracle/data/orcl/foo03.dbf';
   SET NEWNAME FOR DATAFILE 8 TO '/var/oracle/data/orcl/foo04.dbf';
   SET NEWNAME FOR DATAFILE 9 TO '/var/oracle/data/orcl/foo05.dbf';
   SET NEWNAME FOR DATAFILE 10 TO '/var/oracle/data/orcl/foo06.dbf';
   SET NEWNAME FOR DATAFILE 11 TO '/var/oracle/data/orcl/foo07.dbf';
   SET NEWNAME FOR DATAFILE 12 TO '/var/oracle/data/orcl/foo08.dbf';
   RESTORE DATABASE;
   SWITCH DATAFILE ALL;
   RECOVER DATABASE;
   }
   

So this process generally has been working fine; datafiles present in the 3/9 backup restore to their new location. The problem is the tablespace I created on 3/12. When the recovery process gets to that point, RMAN outputs:

creating datafile file number=12 name=/opt/oracle/oradata/orcl/foo08.dbf
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 03/14/2014 13:24:41
RMAN-20505: create datafile during recovery
ORA-01119: error in creating database file '/opt/oracle/oradata/orcl/foo08.dbf'
ORA-27040: file create error, unable to create file
Linux-x86_64 Error: 2: No such file or directory

Now, I know that I could work around this by just creating the directory at the old location, letting RMAN restore into it, and moving the datafile later. But I'd like to understand why my last rename command isn't working, or what I need to change to get it to rename when restoring the archivelog.