Based on an Audit of the code, this component has the following uses of ksort without an explicit sort order which means SORT_REGULAR is applied by default and this sort behavior changes in PHP 8.2.
See: https://php.watch/versions/8.2/ksort-SORT_REGULAR-order-changes

Instances:

• ./lib/grade/grade_category.php:            ksort($children_array);
• ./lib/grade/grade_category.php:        ksort($children_array);