Thanks for the tip. Turned out adding type="image/svg+xml" to the <object> tag worked wonders. I passed this to the developers of LatexML who have added this as well.
Trying to validate my EPUB with epubcheck revealed that while my Latexml-derived EPUB is v3.0, when using Calibre to make some edits it saves only (?) as EPUB v 2.0, which then fails the epubcheck since the file contains MathML and xml/svg. Can Calibre write EPUB3 files? Am I missing an options?
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