I think I might've found a somewhat workable workaround for this problem.
Before turning a page, hold the lower middle button (menu button) for 3/4 to 15 seconds. Now prefetching should work on the next page.
You don't have to do it right before you turn the page. The time needed depends on the book and if you do it right after you turn a page (this takes longer, so you still can't skip through a book very fast).
PS. Hold it for at least 3/4 seconds, otherwise the menu will show up.