Ok, it was only an assumption as i had this issue only in the new version with font-preview. Another thing that led me to this assumption: if i delete the fonts before saving the epub can be opened without problem. Its this Libertine dejavu crap which is just wasting space on my e-reader.
New bookid is just psrt of my clean up script (get rid of html elements in the description, separate a list of authors into single authors meta info, grab some informatuon fram amazon and so on...)
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