If a ticket has been linked to a Tracker, it will no longer show up in searches when an agent attempts to merge another ticket into it.
Steps to repro:
- Create a ticket
- Assign that ticket to a Tracker
- Create another ticket by the same customer
- Try to merge the new ticket into the original
- Normal merging
- Search for ticket ID returns 'no records'
- Search for customer shows all tickets for that customer apart from the one linked to a Tracker