Bug - Avast passwords not locking?

Avast has three checkbox options for locking
a) lock after closing the app
b) after n hours
c) after closing your web browser

I have tried a) and c) and it does not work. This means the security it has is less than before, as long as I have unlocked it once anyone can see my passwords? I assume this is a bug?

Avast last updated 20190103
Avast online help appears to be old for avast passwords.