In order to replicate this bug: 1. Open LibreOffice Writer 2. Select 'More Styles...' from the styles dropdown 3. Select 'Load Styles' from the 'Styles and Formatting' menu 4. Click 'From File...' and select any file 5. 'Text Body' and 'Default Style' remain as they were instead of updating to the style in the target document This is an irritating bug, as obviously the Text/Default styles are the ones I use the most, so their failure to update is hugely aggravating.
You have to tick the "Overwrite" checkbox in the dialog. Closing. I almost confirmed this myself - I read the help and there I noticed Overwrite :)
Thanks, @Buovjaga!