LO Writer refuses to save documents to the specified directory (B:, a ramdrive), instead always reverting to <C:\Users%Username%\AppData\Roaming\LibreOffice\4\user\template>.
It used to work correctly but fails with the current install (v.25.8.0.4)…
Probably tdf#167388
Please read the original report, not only the subject.
The bug only afflicts new documents.
Did you ever use OneDrive? See this question on a Microsoft site, https://techcommunity.microsoft.com/discussions/onedrivedeveloper/how-do-i-stop-onedrive-from-being-my-default-directory/1689407