Avast 20.7.2425 (build 20.7.5568.590) Windows 10
If I try to open any LibreOffice file in Documents, regardless of extension, I get "file locked by unknown user". If I open a file on a different partition or a different folder that is not listed as protected, it works fine. I can create a new file, save it but when trying to open it later, I get the same error. Disabling the Ransomware protection makes the problem go away. I get no notifications from Avast at all. Something also removed the LibreOffice application from my PC, so I had to reinstall it. I tried to add LibreOffice Base and Writer to allowed apps but it makes no difference.