Listeners listening for Tempo plugin Events stop working after updating Tempo

Tempo ApprovalCreatedEvent and ApprovalEvent no longer trigger Script Listeners after upgrading tempo to 10.11.1 from 10.10.0. It appears that Tempo no longer fires the events but I cannot prove that other than the fact the listeners are no longer triggered.

Steps to reproduce

1. Install Scriptrunner 5.6.10 into a Jira 8 instance
2. Install Tempo Timesheets 10.10.0
3. Create 2 basic listeners that just listen for the ApprovalCreatedEvent and ApprovalEvent
4. Create a tempo account and a team.
5. Log some time on an issue as one of the team members
6. Get a valid user to approve the timesheet
7. Check the listeners have been triggered (they should work)
8. Upgrade Tempo to 10.11.1 (current latest)
9. Repeat step 5 to 7 and the listeners will no longer trigger.

The bug can be reproduced without upgrading scriptrunner.

See the video here for a demo of the bug in action.

Update:

This appears to impact any tempo events configured in script listeners before upgrading a Tempo plugin. I installed Tempo Planner 7.13.0 and configured a listener with these events:

• AllocationCreatedEvent
• AllocationDeletedEvent
• AllocationUpdatedEvent
• AllocationEvent

The listener triggers correctly before I upgraded Tempo Planner to 7.14.4, but as soon as I upgraded just tempo, the Listeners stop getting triggered by any of those configured events.