With the 1.0.7 beta for iOS, I'm seeing inconsistent behavior with regards to the track order for albums with multiple discs.

Good album (sorted by disc + track):
1.01 TitleA
1.02 TitleB
2.01 TitleC
2.02 TitleD

Bad album (sorted by track + title):
1 TitleA
1 TitleC
2 TitleB
2 TitleD

In both cases, the disc fields are set correctly as far as I know (i.e. show up correctly in foobar2000 for Windows). I've tried with and without leading zeros in the disc number, but that doesn't help.

Is there anything special that I need to do here? If I'm leaving out some important information, let me know how I can help with that.