That code is basically the same as what I use. Checking one of my books with the Kobo firmware 4.20.x, the image can be zoomed. The most likely reason is that something has happened that the book was not sent to the device as a kepub. Are you using the KoboTouchExtended driver to send the books as a kepub? If so, check that it is still installed and active. There are occasional problems were it needs to be reinstalled.
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