The cover shown during sleep is for the book most recently read. That is defined as the book with the highest timestamp in the recently read field in the database. That means if you open two books with the correct time on the device, the last opened will show as the cover. If you then set the time to somewhere in the past, the last opened will still show. But, if you then open that book, the last read timestamp will be changed to whatever the clock is showing. Then the other books will show as the cover is it has the later last read timestamp.
So, apart from the clock changing, everything is working as expected.
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