Issue Summary

The Epic Fixed Date Milestone edit popup does not save dates and shows a blank screen after updating.

Steps to Reproduce

1.  In JA Pick any Epic
2. Navigate to the "Time/Skills" tab
3. Create a "Fixed Date Milestone", leaving "Target/Initiation" and "Target Complete" blank
4. Save the Milestone
5. Click the pencil icon to edit your new Milestone
6. In the popup, provide dates for one or both "Target/Initiation" and "Target Complete"
7. Press Save

The issue is only reproducible in JA 10.126.0 Build 10.126.0.37246 looks like a regression as not reproducible in 10.123.3 or 10.125.3 and affects both New and OLD Nav.

I have recorded a quick video to demonstrate the behavior.

Expected Results

The date(s) are saved and subsequently reflected back on the "Time/Skill" Tab

Actual Results

The date (s) are not saved and the popup stays open but with a blank screen.

Workaround

Input the "Portfolio Ask", "Target/Initiation" and "Target Complete" before updating and it will save correctly.