I don't remember if it's been mentioned, but since it's related to this perhaps by how the CSS is modified, the fix might be related as well.
In various ePubs, as well as one I'm working on now, quotes are inside a margined div and set to a smaller font:
Quote:
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div.quote > p { font-size:90% }
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M3 displays it larger. For that, margins, and maybe other things, it seems many tags might be overwritten. For font-size, is it safer to just override the body tag? Maybe text-indent can be fixed though since it could be tricky, I wouldn't mind not having a feature to adjust it. I'm not sure if there are other CSS elements that might show errors, but could it be wiser, for other CSS, to overwrite only some tags, like p, and if something is defined in another class, let it be?