[duvanmonsa]

I had the same error i did this piece of code and the status code will be force to be 200 in my case was when i was showing the user public profile.

function bbp_fix_users_404_headers() {
  if (bp_displayed_user_id() != 0 && is_404() ) {
    global $wp_query;
    $wp_query->is_404 = false;
    status_header( 200 );
  }
}
add_action( 'wp', 'bbp_fix_users_404_headers',0 );