German collation correct?

Avery Chan <[email protected]>
Newsgroups gmane.comp.lib.icu.general
Message-ID <[email protected]> 
In some cases 'ä' will be converted to 'ae' in German (the case where 
7-bit ASCII is used). I noticed though, in ICU, collation order for the 
following strings doesn't sort as expected.

ad
äx
af


sort as

ad
af
äx

Is this correct? Should äx sort as aex?

Thanks,

Avery
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