[title-raw] operates wrong with polish diacritic characters

I have enabled "blog" module, set up path pattern like this:
[type]/[yyyy]/[mm]/[dd]/[title-raw]

I have created two blog entries with following text as a title (very hard to pronounce even in Polish, good test for the modue :>):
Gżegżółka grzała grzańca, gdy grzmiący grzmot gromko grzmiał grożąc grzesznikom.

First I have disabled "Transliterate prior to creating alias", effect:
blog/2008/02/12/g%C5%BCeg%C5%BC%C3%B3%C5%82ka-grza%C5%82-grza%C5%84ca-gdy-grzmi%C4%85cy-grzmot-gromko-grzmia%C5%82-gro%C5%BC%C4%85c-grzesznikom

Then, I have enabled "Transliterate prior to creating alias", effect:
blog/2008/02/12/gzegzolka-grzala-grzanca-gdy-grzmiacy-grzmot-gromko-grzmial-grozac-grzesznikom

Where's the problem?
In "disabled" version, there is one character ommited, the path should be (I have underlined missing character):
blog/2008/02/12/g%C5%BCeg%C5%BC%C3%B3%C5%82ka-grza%C5%82a-grza%C5%84ca-gdy-grzmi%C4%85cy-grzmot-gromko-grzmia%C5%82-gro%C5%BC%C4%85c-grzesznikom

I have Drupal 6.0-rc4 installed with newest Pathauto from today.