Trying the MacOS Monterrey first Beta release and the only app not working so far is Avast Premium Security, all of the Core shields extensions no longer load, they are always off. Under the Mac System Preferences > Security & Privacy > Privacy tab > Files and Folders, Avast Security and com.avast.hub have full disk access but they are greyed out.
Hello,
thanks for informing us; please see https://forum.avast.com/index.php?topic=286883.0
Kind regards,
Ondrej Kolacek