STEPS TO REPRODUCE:
1. Login as Resource dummy
2. Create a Project ABC and add Resource1 and Resource2 to the participants list
3. Navigate to Collaboration tab - Discussion
4. Click New
Topic Name: Test
Access: Check the box Selected Resources/Groups and select Resource 1 alone
5. Submit and Return to the List page
6. Click on the icon View Participants
Expected Result: There will only be 2 participants - Resource Tom and Resource1
Actual Result: There are many resources in the Topic participant list who are not even part of the project.
If a topic instance-id is same as MESSAGE or CATEGORIES instance-id then those object participants are getting displayed along with topic participants.