This version has many changes, please check the following list carefully. This require execute an database update (update.php). It is recommended to make a backup of the database first.
Changes since 8.x-2.0-beta1:
Issue #3129484 by alexshipilov, matthand: Drupal 9 readiness Issue #3128304 by brenk28, matthand: D7 function check_plain used
Fix error on variables sass file
Small fixes and patches