Ticking 'Hide synchronize' in JBIC gives 400 error

In Confluence, go to the Requirement Search

Select requirements and click on Actions > Create Jira issues

If you have never created issues from requirements, do it by creating a template and drag and dropping a couple of requirements on the template. ( )

Once you have, click on the button ‘Hide synchronized’ on the left sidebar. You will get a 400 error