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Well formatted ebooks do not have a line-height property at all. The default is set by font metrics of selected font and if you set it in CSS, then it breaks almost all ereaders.
Only PDFs (and thus for POD or other publishing, or fixed layout for tablets) should have a line-height. Leave it undefined in Wordprocessor style and then conversion from docx to epub has no line-height in CSS. Amazon uses epub source to make mobi, azw3 and kfx.
The CSS line-height and many other valid CSS only make sense on web pages, not ebooks!
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