Hi Donald, thank you for your finding. Indeed, I was able to see the same error, specifically when Security Category filter is opened or a standard is selected in the sidebar. Nevertheless, you should still be able to modify the issue status or assignee, as the error seems to be specific to a different endpoint issues/search.
Please let me know if you encounter this issue when Security Category filter is not selected and closed, and, in the meantime, you may follow this ticket which should address the issue.