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Lessons learned today:

There are occasionally reasons for saving an ODT document in DOCX. Principally if you need to send it to someone who is unable to, or for other reasons does not, use ODT, or when using pandoc to export to EPUB. (As previously mentioned, it turns out that LibreOffice's EPUB export is horribly broken, because it is built on top of a piece of alpha-quality abandonware called libepubgen. It also transpires that pandoc's ODT reader plugin is also badly broken. The problem can be worked around by using LibreOffice to save the document as DOCX, then using pandoc to convert from DOCX to EPUB, and then running the EPUB through Sigil or Calibre for fix-up.)

However, if you then accidentally try to open that DOCX in LibreOffice for further work, edit it, and try to save back to ODT, the styles in the document will end up HORRIBLY buggered in bizarrely incomprehensible ways, and you'll be going crazy trying to figure out what went wrong.

So maybe don't do that.