I've mentioned this one before, but it's worth mentioning again. Any time the the font size changes, whether by keyword (x-small, bigger, etc.), by relative measure (1.2em, 20px), or simply by tag (h1, sub, sup), the firmware needs to recalculate the line-height. It does not do so at present, at least with sideloaded books.
My current workaround is to put line-height: normal; into the book's stylesheet for every such class, but that shouldn't be necessary in the majority of cases.
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