Adding More than one folder to Test Plan in Test Repository removes tests from the folders previously there in the Test Plan board

Short Description
Adding More than one folder to Test Plan in Test Repository removes tests from the folders previously there in the Test Plan board.

How to reproduce

1. Go to Test Repository, click a folder and Add | Test (s) to Test Plan
2. Click ‘Yes’ to ‘Copy folder structure to the Test Plan Board’
3. Select the desired Test Plan from the drop list
4. Click ‘Add Selected’
5. Tests Successfully Added to plan
6. View the Test Plan Board, and you can see the tests are in the folder
7. Go back to the Test Repository and try to add another folder
8. Click ‘Yes’ to ‘Copy folder structure to the Test Plan Board’
9. Select the desired Test Plan from the drop list
10. Click ‘Add Selected’
11. Tests Successfully Added to plan

Actual result/Attachments
The tests of the folder are now in the board folder.

Expected result
The tests should all stay in the respective folder.