$screen
may not be available yet when pre_get_posts
fires. Try this instead:
public function my_post_type_default_sort( $query ){
if(!isset($_GET['orderby']) && is_admin()) {
$orderby = '0';
}
if($query->is_main_query() && is_admin() && is_post_type_archive('my_post_type') && $orderby=0) {
$query->set('orderby','scr_date');
$query->set('order', 'ASC');
}
}
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