php - How do you prevent WordPress on Azure from changing dots to underscores in the URL? -

i have wordpress site hosted on azure app service (not dedicated vm) , need people access front page via url like: http://www.example.com/?tracking.id=12345

however, wordpress re-writing url replacing dot in tracking.id underscore: http://www.example.com/?tracking_id=12345

how can prevent wordpress doing this?

what's interesting happens on home page, query vars stay intact everywhere else. might able figure out what's going on if take @ wp-includes/canonical.php (that's redirect_canonical filter located)

function prevent_underscores( $redirect_url, $requested_url ) {      if( isset( $_get['tracking_id'] ) ) {         return $requested_url;     }        return $redirect_url;    }  add_filter( 'redirect_canonical', 'prevent_underscores', 10, 2 );