To resolve the issue with a milestone not appearing in a timesheet, please use the following steps:
Internal Milestones
Go to the Internal Matters console.
Select the Matter.
Put into Edit mode.
In the Milestone template field, re-select the Workflow template.
The window Keep or replace existing milestones will pop up.
Select Replace and leave the checkbox empty, and select OK. This will update the matter.
External Milestones
Go to the Standard Matters console.
Select the Matter.
Put into Edit mode.
In the Milestone template field, re-select the Workflow template.
The window Keep or replace existing milestones will pop up.
Select Replace and leave the checkbox empty, and select OK. This will update the matter.