There may be or may not be a WBS Gantt-Chart for Jira product logo next to the name of the Gantt Chart that appears above the operations toolbar.
When is it displayed?
The product logo is displayed when Gantt, which was introduced from version 9.0, is displayed.
In case of the Gantt chart displayed directly from Project or Filter, the product logo will NOT be displayed.
See General user information for the more details of Gantt, Project, and Filter.