No, a milstone only signifiesa "milestone" in the project timeline. Dates flow on milestone tasks like any other task.
Best practice is to use milestones on parent tasks, so you can group the tasks together under a milestone.
The way to fix a date is to type in the start or planned completion date manually, thereby changing the constraint to Must Start On or Must Finish On.
Task Constraints: https://experienceleague.adobe.com/docs/workfront/using/manage-work/tasks/task-constraints/task-cons...
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