Currently it is impossible to show the avatar in the memberlist by using the

in the template.

Almoust all the data is presented in memberrow - but not avatar, I think it is essential data.

Please add avatar img data for using in 'memberlist_body' template:

File memberlist.php, function show_profile($data):

just add :
'AVATAR_IMG' => get_user_avatar($data['user_avatar'], $data['user_avatar_type'], $data['user_avatar_width'], $data['user_avatar_height']),

in the return array.