I am only another member of the Brave Community forum.
As a test, let’s see if a Brave Browser user Profile avatar will show for an additional Profile. Try:
Create and use a new Brave Browser user profile (Menu --> More tools --> Add profile) - only ← meaning, do not have any other Brave Browser user profile tabs/windows open. When creating this new Brave Browser user profile for test purposes, do not import anything, do not allow/enable any Brave Browser “bells and whistles” such as Brave Rewards, Brave Talk, etc.
Does the user Profile avatar show as expected?