Some milestone icon not display in Gantt View
I created a project plan with a gantt view with sign-off milestone and I wanted to have the diamond icon show for all milestone. Some of the milestone have a diamond icon defaulted but some of the milestone is not link with the icon. I am not able to find any option to edit the icon.
Refer to the screenshot, the go live readiness and warantty completion sign off to show diamond icon. I tried in both project plan and report gantt view but not successful.
Kindly advise. Thanks