Now I have found a few PDFs, for which the keywording sometimes is ok ("möglich"), sometimes is wrong ("mglich") in the same document. I suspect now that it might have something to do with the fonts. For files that only use fonts Reader defines as type '1' (embedded) keywording gets always wrong. For files that additionaly use fonts defined as 'TrueType', the results are mixed. Maybe this is the right track to find the error?
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