Atlassian have deployed a platform update that has resolved this issue.

The issue appears to be caused by a recent code change on the Atlassian Platform. Updates currently being tracked here: https://ecosystem.atlassian.net/browse/ACJS-1032

On screen notification flags in Confluence applications are not working correctly. This is currently affecting the Comala Workflows Lite Cloud product. Apart from the message notification flag the rest of the application is functioning normally.