While clicking on "✕" (cross mark) to delete "non-working days" in a board has no result

Issue Summary

While clicking on "✕" (cross mark) to delete "non-working days" in a board has no result

Steps to Reproduce

1. Click on "Boards" in the top navigating bar
2. Choose a board and click on the "Board" option in the right side corner and click on "Configure"
3. Now click on "Working days" under configurations
4. Try to add a non working date.
5. Try to delete it as mentioned in the KB for Configuring working days
   This behaviour is not reproducible in jira 8.8.1 and we have also adjected the timezone as per this KB but same results.

Expected Results

The existing non-working date should be deleted when we click on "✕" (cross mark)

Actual Results

There's no response from jira and there is no response & nothing happens when we click on
"✕" (cross mark)

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available