[Dovecot] Sieve and fileinto encoding change?

Hello,

I have changed from debian servers (debian lenny 5) running dovecot 

1.1.16 to new ones with ubuntu 12.04 and dovecot 2.1.5 and now I'm having problems with sieve filters storing mails in folders with spanish characters (accents).

Myh problem is the one described at 

http://www.dovecot.org/list/dovecot/2009-October/044061.html and http://dovecot.org/list/dovecot/2009-July/041690.html, that is, in my sieve scripts (generated with horde ingo) folder's names are in utf-7 instead of utf-8.

Although I'm planning to patch ingo, my question is why those same 

scripts, with utf-7 folder's names, are working with dovecot 1.1.16 but not with 2.1.5? Because in my old servers those scripts worked without any problem...