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So I investigated the cases I posted above. Turn out I don't even know anything any more.
Basically the EPUB that person sent me has problem with unresolved hyperlink. Which shouldn't be solvable with just adding the UTF-8 encoding, but somehow he said it worked. To make the matter worst, the file already has encoding, but it was using single quote and my tools failed to detect that, so it added another xml encoding header. I tested locally with Kindle Previewer and both file failed to load, but he insisted that it actually fixed his problem. So I don't know anymore and I gave up.
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