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Make sure the Calibre driver isn't converting the files to kepub.
Once it's an epub it's not txt or HTML. Make sure the language you set in Calibre for the conversion (and original LO Writer) is a language your dictionaries (or working epubs) use.
My txt and htm pasted in to LO Writer and extra docx saved work just the same as bought epub when converted by Calibre.
Direct conversion of txt and htm via Calibre should work too if the language is set, but there may be no system TOC or nice formatting.
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