The recent issue relating to atl.jira.view.issue.left.context that I am aware of related to it not appearing in the new issue view. The TypeError problem you’ve reported looks like a different issue.
As part of this investigation, a configuration change was made but rolled back. It is believed that this change could have caused the TypeError issue you reported. If you are continuing to see this issue, please report back. Otherwise we can attribute the problem to the configuration change that was in production briefly.