When I switch to new file in a web browser, the same behaviour. Generally in an epub, the chapters are in individual files. What I saw in my testing was last page in a chapter did not take up the full display area and the next chapter started at the top of the page once my next scroll happened. I did not lose any text at the end of a chapter. If you really feel enthused, you could merge all the xhtml files in an epub into a single file though that is likely to break many ereaders.
I've attached an image from calibre's ebook viewer on a test file where I combined all the xhtml files into a single file and the file itself.
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