{live-search} doesn't support umlauts (utf-8?)

We have a space where a page called "Anhänge" is in.

So if you have a livesearch macro in that space and type an "a" the page (and others) appears.

This also does it, when typing the next two chars (e.g. anh)

But when you enter an "ä" all listed pages are gone.

It also does this with other german umlauts.

(see images)