Faq/General/Defender Controlled folder access exception
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Setting up Defender Controlled folder access exception for LibreOffice
The Defender Controlled folder access feature might prevent LibreOffice to save files to user's folders. In this case, "General input/output error while accessing Document" or "File not found" errors will be shown.
To workaround this, add LibreOffice main module (C:\Program Files\LibreOffice\program\soffice.bin) to Defender Controlled folder access exclusions. Please refer to this Microsoft knowledge base article for details.
See also: Installing LibreOffice on Windows with Defender Controlled folder access feature enabled