@HolyPhoenix said:
I make my avatars square with round borders from the admin panel via the stylesheet override. Super simple and effective. I don't see a reason for the styling as a setting.
Can you share the code please?
I have also square avatars with round borders, but not everywhere on the site they are square with round borders. Like the profile picture in the corner

and the avatars on the comments

and on the user page, the uploaded avatars (the standard avatars are with round borders).

Is this also with your code? I use this code
[component="user/picture"], [component="header/userpicture"], .user-icon, .user-img, .avatar, .avatar-wrapper, .users-box, .registered-user {
border-radius: 12px!important;}