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I would get Writer to save as DOCX and import it directly into calibre-editor, then save as EPUB. If any significant editing was required (very unlikely in my case) I'd do it in Sigil.
Calibre recently added support for strict OpenXML which is what I suspect Writer might create. The differences between strict and the original MS spec are at the edges. ECMA had to make some changes, even if only on the principal of bloody-mindedness.
BR
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