Publishers can have a corrected book pushed to reader's Kobo library automatically if they want to, I know because when I complained to a publisher about a particularly bad book I received an updated KePub when I synced (and the updated ePub as available for download in my library) without needing to contact Kobo about it.
I've also had other KePubs updated automatically when I synced, ones that I haven't even read yet and so I hadn't had a chance to complain to the publisher and didn't even know the book needed updating. But in those cases when I downloaded the ePub version it hadn't changed, so I think these must be ones where only the KePub as updated, i.e. perhaps the book was reprocessed to fix problems that occured in Kobo's original conversion from ePub to KePub.
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