This issue is targeted to be fixed in Clarity PPM 15.6.1.
Workarounds:
Option 1: Set milestones to
Task Mode of Auto Scheduled in MSP.
For already impacted milestones: Change the task to auto scheduled in MSP, then update the start/finish dates to the correct date.
To change the Task Mode for a task:
- Option 1: Go to a task view in MSP, and select Auto Scheduled from the drop down. Any Tasks that are Manually Scheduled will have a thumb tack in the Task Mode field.
- Option 2: Double click on the task in MSP and change Schedule Mode from Manually Scheduled to Auto Scheduled and click OK
Option 2: Revert back to an older Microsoft Project Update. Link to one MSP2016 update where it does not happen is the June 6.2017 update from Microsoft:
KB3191934Note: It's recommended to test the impact in non production to make sure reverting back doesn't introduce any issues fixed on later updates.