Because searching happens in two phases, one is searching the actual book text and the second is actually displaying that text rendered in the book. For various reasons, the rendered text can be hidden/not displayable, in which case the search result is removed when the viewer tries to find the displayable text and fails. However, this should be exceedingly rare in practice (I have mostly seen it on fixed layout EPUBs to date. So if you have examples of it happening, I'd like some text cases.
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