Maybe this is related to this case. After updating to FW 2.4.0, five Japanese language epubs (not kepubs) did not go to the carousel (I only tried these five Japanese books, other language epubs worked fine.). After synchronizing, four of them were gone from the datebase and from the device. Only the related xml files in the Adobe Digital Editions folder remained there. Unfortunately, I did not backup the database before synchronizing.
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