When adding a follow up activity on an existing case activity with multiple assignees only one is saved
Overview
When I add a follow up activity on an existing activity in a case (does not happen on non-case activities) and add more than 1 assignee, only the first assignee is actually saved on the activity.
Reproduction steps
- Find an existing case activity
- Add a follow up activity with multiple assignees
- Hit save
Current behaviour
Only the first assignee is saved
Expected behaviour
All assignees should be saved
Environment information
CiviCRM 5.66.0