diacritics not properly ignored/sorted

[MrSinatra]

5.572

i have some Husker Du tracks, some have the diacritics over the U, some don't. the ones that do come first in the albumartist (large icon artwork) listing, then huey lewis, then humble pie, then the husker du's without diacritics.

first:

Hüsker Dü

huey lewis
humble pie

second:

Husker Du