I can confirm seeing this. It seems that the information was inserted incompletely:
$ TZ=America/Rio_de_Janeiro date Mon Oct 15 09:29:34 BRT 2007 $ TZ=America/Sao_Paulo date Mon Oct 15 10:29:41 BRST 2007
My feisty system currently has tzdata version 2007f-0ubuntu0.7.4
I can confirm seeing this. It seems that the information was inserted incompletely:
$ TZ=America/ Rio_de_ Janeiro date Sao_Paulo date
Mon Oct 15 09:29:34 BRT 2007
$ TZ=America/
Mon Oct 15 10:29:41 BRST 2007
My feisty system currently has tzdata version 2007f-0ubuntu0.7.4