• Make a new document and write some words

• Open the Style Inspector and watch out for changes in lowest Section („Character Direct Formatting“)

• Change the font of the current style (via Style > Edit Style)

• Select a word that you’ve previously written and replace it, by typing it again

• Notice how the word that you’ve replaced is now directly formatted, meaning that if you change the styles’ font again, this word will not change font

TL;DR: When selecting content and replacing it, LibreOffice doesn't simply use the selected style to format the new content, it formats them as directly formatted ... no clue why, but i don't think this is the intended behaviour

For months now i've been bothered by this, constantly having to clear direct formatting. I don't think that the version is very important, but my version on Manjaro Linux Stable is the following:

Version: 7.2.2.2 / LibreOffice Community Build ID: 20(Build:2) CPU threads: 4; OS: Linux 5.10; UI render: default; VCL: gtk3 Locale: de-DE (en_US.utf8); UI: en-US 7.2.2-2 Calc: threaded