ISBN import with Umlaut

There seems to be a problem with Umlaut ö, ä, ü (maybe other characters?) in the ISBN import. The following should be reproducible:
1. Import by ISBN = 9783531149950
2. Quick search for the author "Dörre" -> no result
3. If one retype the author again by hand, then the search will work again.
There might be a problem with the character encoding? Can someone check?
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