Problem copying an activity

Hello,I hope this issue hasn't been reported yet. I searched for it in the version history and in the forum, but I couldn't find it.Here's my issue: when I try to copy an activity with attached sub tasks to do ("liste des points à traiter"), I check the box to copy these items, but they are not added to the new activity.We recently upgraded to version 12.2.1. This feature used to work in our previous version (I can't remember the version number).Thank you in advance for your help.